These probabilities are calculated based on the given probability mass function and represent the likelihood of specific events occurring with the random variable x.
What is the probability of getting a sum of 7 when rolling two fair six-sided dice?P(x = 3) represents the probability of getting the value 3 from the random variable x. In this case, the probability is 1/4, which means there is a 1/4 chance of getting the value 3.
P(x < 4) represents the probability of getting a value less than 4 from the random variable x. Since all the values in the given probability mass function are less than 4, the probability is 1, indicating that it is certain to get a value less than 4.
P(x > 3) represents the probability of getting a value greater than 3 from the random variable x. In the given probability mass function, there are 3 values greater than 3 (1/4 + 3/8), so the probability is 3/8.
P(2 < x < 4) represents the probability of getting a value between 2 and 4 (exclusive) from the random variable x. In the given probability mass function, there are two values within this range (1/8 + 1/4), so the probability is 3/8.
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What is |6 3/8 - 2| + |-8 5/8 + (-1)|?
Answer:
14
Step-by-step explanation:
Find the area of the composite figure. Please help me
Answer:
51.5 ft^2
Step-by-step explanation:
Sophia invest $12,350 in a account that earns 4.5% annual simple interest. Assuming she makes no additional deposits or withdrawals, how much interest will Sophia earn after 36 months?
Answer:
I DO NOT KNOW
Step-by-step explanation:
I am here for the answers
I am hungry
Pizza
Let T: R² → R³ be a linear mapping, satisfying T(1, 2) = (1, 0, 1) and T (2,5) = (0, 1, 1). Calculate T(0, 1).
(a) (0,2,-3)
(b) (-2, 1, -1)
(c) (-2, 5, 1)
(d) (1, -1, 0)
Let T: R² → R³ be a linear mapping, satisfying T(1, 2) = (1, 0, 1) and T (2,5) = (0, 1, 1). T(0, 1) is option (b) (-2, 1, -1)
Let T: R² → R³ be a linear mapping, and T(1, 2) = (1, 0, 1) and T (2,5) = (0, 1, 1).
To calculate T(0, 1), we must first determine the matrix A of T with respect to the standard basis of R² and R³.
Using the values of T(1, 2) and T(2, 5), we can create an augmented matrix with the standard basis vectors of R²:1 2 1 0 01 2 0 1 1
Using Gaussian elimination to solve this augmented matrix, we get:A = \begin{bmatrix} 1 & 2 \\ 0 & 1 \\ -1 & 1 \end{bmatrix}
Now, we can apply T to (0, 1) as follows: T(0, 1) = A(0, 1) = \begin{bmatrix} 1 & 2 \\ 0 & 1 \\ -1 & 1 \end{bmatrix} \begin{bmatrix} 0 \\ 1 \end{bmatrix} = \begin{bmatrix} 2 \\ 1 \\ 0 \end{bmatrix}
Therefore, the answer is option (b) (-2, 1, -1).
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We say that the decimal expansion 0.d1d2d3 ...dn ... is repeating if there is an m >0 such that dqm+r = dr for all q € N. Show that the set of all real numbers that have a repeating decimal expansion is a countable set.
The set of real numbers with a repeating decimal expansion is countable because it can be mapped to a countable set of unique pairs of rational numbers.
To show that the set of all real numbers with a repeating decimal expansion is countable, we can prove that it is at most countable.
Let's consider a repeating decimal number 0.d1d2d3...dn(dn+1...dn+m-1dn+m...). This can be represented as 0.d1d2d3...dn + (dn+1...dn+m-1dn+m...)/([tex]10^m - 1[/tex]).
We can see that for any repeating decimal number, the part before the repeating block (0.d1d2d3...dn) is a finite decimal representation, which is a rational number.
The part within the repeating block ((dn+1...dn+m-1dn+m...)/([tex]10^m - 1[/tex])) is also a rational number because it can be expressed as a fraction.
Since both the finite decimal part and the repeating block part are rational numbers, we can map each repeating decimal number to a unique pair of rational numbers (finite decimal part, repeating block part).
Now, we know that the set of rational numbers is countable. Therefore, if we can show that the set of unique pairs of rational numbers is countable, then the set of repeating decimal numbers is at most countable.
To show that the set of unique pairs of rational numbers is countable, we can use the fact that the Cartesian product of countable sets is countable.
Since the set of rational numbers is countable, the set of unique pairs of rational numbers (finite decimal part, repeating block part) is also countable.
Thus, we can conclude that the set of all real numbers with a repeating decimal expansion is at most countable.
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The cumulative frequency of the 3rd bin in a frequency distribution table represents: a. The number of data values that are less than the maximum value of the 3rd bin. b. The percentage of data that falls into the 3rd bin. C. The cumulative deviation of the 3rd bin in percent. d. The frequency of data values that are larger than the minimum value of the 3rd bin.
The cumulative frequency of the 3rd bin in a frequency distribution table represents the number of data values that are less than the maximum value of the 3rd bin. The correct option is a.
What is a frequency distribution table?A frequency distribution table, often known as a frequency table, is a table that displays the frequency or amount of occurrences of different values in a dataset. Frequencies may be written as total values or as percentages of the total (relative frequency).
What is cumulative frequency?Cumulative frequency is the total frequency of values less than or equal to a given value in a dataset. The cumulative frequency of the 3rd bin in a frequency distribution table represents the total number of data values that are less than or equal to the maximum value of the 3rd bin.
Because it is a cumulative frequency, it contains all the values that came before it as well as its own frequency. The frequency distribution table is used to compute cumulative frequency.
The calculation of cumulative frequency may be done using the data's ascending or descending order.
Thus, the correct option is a.
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Suppose the CDF F is a continuous real function and note that this does not imply F is differentiable. Assume for simplicity that F(0) = 0 and F(1) = 1 (this does not change the major statements below but makes the proof a bit cleaner). (j) Show that if X, Y are independent F-distributed RVs then for any n in N (ii) Conclude that P(X = Y) = 0 (remember that you cannot assume F has a density). Hint: n above can be arbitrarily large. (iii) Suppose X1,. . . , Xn is a sample drawn from F. Show that the probability that all Xi differ from one another is 1. in other words that P(exist i < j with Xi =Xj)=0.
For the CDF of a continuous real function, the answers are as follows:
(i) P(X = Y) = 0 because P(X ≤ Y) > 0 and P(X < Y) > 0 and both are strictly positive
(ii) P(exist i < j with Xi = Xj) = 0 which is a contradiction.
(i) Suppose the CDF F is a continuous real function and note that this does not imply F is differentiable. Assume for simplicity that F(0) = 0 and F(1) = 1 (this does not change the major statements below but makes the proof a bit cleaner). If X, Y are independent F-distributed RVs, then for any n in N, we have; P(X ≤ Y) = P(X ≤ Y, Y ≤ X) = P(X ≤ Y|Y ≤ X) P(Y ≤ X) = P(Y ≤ X|X ≤ Y) P(X ≤ Y) = P(X ≤ Y|X ≤ Y) P(X ≤ Y) = P(X = Y). Hence, P(X = Y) = P(X ≤ Y)P(Y ≤ X) = P(X ≤ Y)P(X ≤ Y) = P²(X ≤ Y).Since F is continuous, P(X ≤ Y) = P(X < Y) = P(X ≤ Y) - P(X = Y). Therefore, P(X = Y) = 0 because P(X ≤ Y) > 0 and P(X < Y) > 0 and both are strictly positive.
(ii) Conclude that P(X = Y) = 0 (remember that you cannot assume F has a density). As for the sample case, we show that P(exist i < j with Xi = Xj) = 0. Suppose, for the purpose of contradiction, that we have X1, . . . , Xn in F such that P(exist i < j with Xi = Xj) > 0. Then, there must be some distinct i < j such that Xi = Xj. Without loss of generality, we may assume i = 1 and j = 2. Then, the probability that this event occurs is; P(X1 = X2, X3 ≠ X1, . . . , Xn ≠ X1) = P(X2 ≤ X1, X3 ≠ X1, . . . , Xn ≠ X1) + P(X1 < X2, X3 ≠ X1, . . . , Xn ≠ X1)Since Xi are independent F-distributed RVs and P(X = Y) = 0, it follows that the probability of the first term in the sum above is zero. Therefore, P(exist i < j with Xi = Xj) = 0 which is a contradiction.
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PLEASE HELP AND ILL GIVE BRAINLIEST
Answer:
2
Step-by-step explanation:
Subtract the number with the term both sides ( which is 9)
[tex] {x}^{2} + {y}^{2} - 6x + 4y = - 9[/tex]
Complete the square for the x terms and y terms.
( To complete the square divide the coefficient term by 2 and square it, then add that product to both sides.)
[tex] {x}^{2} - 6x + 9 + {y}^{2} +4y + 4 = - 9 + 9 + 4[/tex]
[tex] (x - 3) {}^{2} + (y + 2) {}^{2} = 4[/tex]
Take the square root of the right side to find the radius
[tex] \sqrt{4} = 2[/tex]
8 z
6
OD
UN
4 3
N
1 2 3 4 5 6 7 8 9
x
Which two equations represent the situation?
o y=jx and y=x-4
o =
O y=3+ and y = X+4
O y = 3x and y = x+4
O y = 3x and y = x-4
Answer:
Step-by-step explanation:
the economic stimulus act of 2008 focused on ________, whereas the american recovery and reinvestment act of 2009 focused on ________.
The Economic Stimulus Act of 2008 focused on providing tax relief, while the American Recovery and Reinvestment Act of 2009 focused on a combination of tax cuts, government spending, and investments for economic growth.
the Economic Stimulus Act of 2008 was enacted in response to the economic downturn that occurred during the Great Recession. Its main objective was to provide immediate relief to the economy by implementing tax incentives and rebates for individuals and businesses. The act aimed to encourage consumer spending and investment by putting more money into people's pockets and reducing the tax burden on businesses.
On the other hand, the American Recovery and Reinvestment Act of 2009 was a broader and more comprehensive economic stimulus package. It included a mix of tax cuts, grants, loans, and direct government spending on infrastructure projects, renewable energy, healthcare, education, and other areas. The goal was to not only provide short-term economic relief but also to make long-term investments that would promote sustainable economic growth and job creation.
Overall, while both acts were aimed at stimulating the economy, the focus of the Economic Stimulus Act of 2008 was primarily on tax relief, while the American Recovery and Reinvestment Act of 2009 encompassed a wider range of measures to boost the economy and address various sectors affected by the recession.
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help wrong answers reported
Answer:
65
Step-by-step explanation:
all triangles angles equal 180°
180-72-43=65
10g⁹ 2. Show that (Zn +n Xn) is a commutative ring with unity assuming it is a commutative additive n' group. Prove that or disprove 23 340 1 is divisible by 341 341 11 77
Given below are the step-by-step solutions to the provided questions:
1. Determine whether 23, 340, 1 is divisible by 341, 341, 11, 77. To prove 23, 340, 1 is divisible by 341, 341, 11, 77:341 is not a prime number since it is equal to 11 * 31, and it is the LCM of 11 and 31.So, 341 is a composite number. To check the divisibility of 23, 340, 1 by 341, we need to find the remainder of 23, 340, 1 when it is divided by 341.Since 341 = 11 * 31, the remainder of 23, 340, 1 when divided by 341 will be the same as the remainder when 23, 340, 1 is divided by 11 and 31, respectively.Remainder of 23, 340, 1 when divided by 11:340 + 23 + 1 = 364364 = 11 × 33Therefore, the remainder of 23, 340, 1 when divided by 11 is 0.Remainder of 23, 340, 1 when divided by 31:10^3 ≡ −1 (mod 31)340 ≡ 12 (mod 31)23 ≡ −8 (mod 31)−8 − 12 − 1 = −21 = −1 × 31Therefore, the remainder of 23, 340, 1 when divided by 31 is 10.Therefore, the remainder of 23, 340, 1 when divided by 341 is 0.Since the remainder is 0, then 23, 340, 1 is divisible by 341, 341, 11, and 77. Hence, the given statement is true.
2. Show that (Zn + nXn) is a commutative ring with unity assuming it is a commutative additive n' group.To prove that (Zn + nXn) is a commutative ring with unity assuming it is a commutative additive n' group:Firstly, we need to prove that Zn is a commutative ring with unity given that it is a commutative additive n' group.Commutativity of addition:a, b ∈ Zna + b = b + aAssociativity of addition:a, b, c ∈ Zna + (b + c) = (a + b) + cExistence of additive identity:n ∈ Zna + n = n + a = aAdditive inverse:For every a ∈ Zn there exists an element -a in Zn such that a + (-a) = (-a) + a = nExistence of multiplication:For a ∈ Zn and b ∈ Zn, their product ab is defined as ab ∈ Zn Multiplication is distributive over addition:For a, b, c ∈ Zna(b + c) = ab + ac and(a + b)c = ac + bcThus, we have proven that Zn is a commutative ring with unity given that it is a commutative additive n' group.Now we need to prove that (Zn + nXn) is a commutative ring with unity given that it is a commutative additive n' group.Zn is a commutative ring with unity and Xn is a commutative additive group. Hence, we have the following:Commutativity of addition:a, b ∈ (Zn + nXn)a + b = b + aAssociativity of addition:a, b, c ∈ (Zn + nXn)a + (b + c) = (a + b) + cExistence of additive identity:n ∈ (Zn + nXn)a + n = n + a = aAdditive inverse:For every a ∈ (Zn + nXn) there exists an element -a in (Zn + nXn) such that a + (-a) = (-a) + a = nExistence of multiplication:For a ∈ (Zn + nXn) and b ∈ (Zn + nXn), their product ab is defined as ab ∈ (Zn + nXn)Multiplication is distributive over addition:For a, b, c ∈ (Zn + nXn)a(b + c) = ab + ac and(a + b)c = ac + bcThus, (Zn + nXn) is a commutative ring with unity assuming it is a commutative additive n' group.
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A small town is trying to establish a transportation system of large and small vans.
It can spend no more than $100,000 for purchasing both sizes of vehicles and no
more than $500 per month for maintenance. The town can purchase a small van for
$10,000 and maintain it for $100 per month. The large vans cost $20,000 each and
can be maintained for $75 per month. Each large van carries a maximum of 15
passengers and each small van carries a maximum of 7 passengers. Find the
maximum number of passengers the transportation system can handle given the
constraints. How many large and small vans will they need to maximize the
number of
passengers
it can service?
its a .......................................Step-by-step explanation:
Use the given values to complete the table. Create quantities proportional to each other and graph them.
10
9
у
8
7
6
5
4
2
4
(4,2)
3
2
1
0
0 1 2 3 4 5 6 7 8 9 10
Choose the item that does NOT have a measurable volume.
a dollar bill
air
a box of crackers
a water bottle
Answer:
Air
Step-by-step explanation:
You can't really measure air
Answer:
Air
Step-by-step explanation:
You cannot measure air because it is invisible.
I need help with this question
Answer:
286 Degrees
Step-by-step explanation:
A circle is 360 degrees, and from the question, we know that it is asking for ACB, so it would be 360 - 74, which is 286 degrees
Brainliest Maybe?
I do a one-way within-subjects ANOVA with one factor and four groups. How many groups would my participants be a member of? O 3 0 1 O 2 4 Question 8 2 pts Which sums of squares is only found in a one-way within-subjects ANOVA? O Between-persons sums of squares O Interaction sums of squares O Between-groups sums of squares Total sums of squares Within-groups sums of squares Question 9 2 pts I do a one-way within-subjects ANOVA and find that my overall model is significant. What do I do next? I would look at my b-weights to see which variables are significant o I would do a post-hoc Tukey test I would do a post-hoc Bonferroni test I would do a simple main effects analysis Question 10 2 pts True or false: On average, eta-squared, partial eta squared, and R-squared are all measures of effect size that refer to the proportion of variance explained within a study. True False 11 39 2 pts When doing a two-way between subjects ANOVA, how many F-tests would I normally run? O1 O2 04 D Question 12 2 pts Which sums of squares is only found in a two-way between-subjects ANOVA? Between-groups sums of squares Between persons sums of squares Within-groups sums of squares Total sums of squares Interaction sums of square?
1. The participants would be a member of all four groups. In a within-subjects ANOVA, participants are exposed to all levels of the factor, so they experience each group.
2. The within-groups sums of squares is only found in a one-way within-subjects ANOVA. This represents the variability within each group or condition.
3. In this case, you would typically conduct a post-hoc analysis to determine which specific groups or conditions differ significantly from each other. Common post-hoc tests for within-subjects ANOVA include the Bonferroni or Tukey tests. These tests help identify pairwise differences between the groups.
4. True. Eta-squared, partial eta-squared, and R-squared are all measures of effect size that indicate the proportion of variance explained within a study. They provide information about the strength and magnitude of the effect being studied.
5. When conducting a two-way between-subjects ANOVA, you would typically run two F-tests: one for each main effect and one for the interaction effect. The main effects assess the effects of each independent variable separately, while the interaction effect examines whether the combined influence of the variables is significant.
6. The between-groups sums of squares is only found in a two-way between-subjects ANOVA. It represents the variability between the different groups or levels of the independent variables.
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Please help with 1 & 2!!! Will mean a lot!! And give brainly!!! Help plz due today
1. to find angle x:
angles on a straight line add to 180º : 180-92º = 88º
to find angle y:
exterior angle equals opposite interior angles: 88+22=110º
2. to find angle x:
angles on a straight line add to 180º : 180-118 = 62º
to find angle y:
exterior angle equals opposite interior angles: 62+52 = 114º
sorry if i got any of the angles wrong, the picture was a bit blurry and I couldn't tell that well, let me know if i got it wrong and i'll fix it
Solve the following equation when x =
2 and y = 4.
3x + 2y + 4 =
Step-by-step explanation:
the answer is x=-4 ,y=-5
-4(z + 3) - 4(5 - 4z) solution
Answer:
12z-32
Step-by-step explanation:
-4z-12-20+16z
What is the value of x in the equation 4(2x + 10) = 0?
-5
-7
5
7
Answer:
Step-by-step explanation:
4(2x+10)=0
8x+40=0
-40 -40
8x=-40
x=-5
Answer:
-5
Step-by-step explanation:
First you have to distribute 4 to 2x and 10, giving us 8x + 40 = 0. Then subtract 40 from both sides, giving us 8x = -40. Now divide -40 by 8, which gives us -5.
answer these 3 questions please :) the table is shown above for these 3 questions
Answer:
Answer
Step-by-step explanation:
for 4. I think sports?
for 5. I think sports also.
Not sure though.. sorry if it's wrong.
Can someone plz help me if u understand plz I beg u and care to explain if wanted
Answer:
first circle is radius= 12.5 inches and diameter= 25 inches
second circle is radius=2 feet and diameter=4 feet
Step-by-step explanation:
radius is the point halfway down the circle. diameter is full length straight across the whole circle.
further analysis;
in the first circle it gives you the diameter which is 25 inches. in order to get the radius you cut 25 in half which is 12.5 inches.
in the second circle it gives you the radius which is 2 feet. in order to get the diameter you need to double 2 feet which is a total of 4 feet.
what is (−4)⋅(−4)⋅(−4)⋅y⋅y
Answer:
64y^2
Step-by-step explanation:
A group of adult males has foot lengths with a mean of 28.48 cm and a standard deviation of 1.41 cm. Use the range rule of thumb for identifying significant values to identify the limits separating values that are significantly low or significantly high. Is the adult male foot length of 31.6 cm significantly low or significantly high? Explain. Significantly low values are cm or lower. (Type an integer or a decimal. Do not round.)
Thus, the adult male foot length of 31.6 cm is significantly high since it falls outside the range of values considered normal for adult male foot length.
Range rule of thumb:The range rule of thumb is a formula used to calculate the range of the data that's spread around the mean. The range is the difference between the maximum and minimum data values. The range rule of thumb estimates the expected range for a normally distributed dataset by taking the difference between the maximum and minimum values, then multiplying that difference by 4. This estimate is usually only useful for datasets with more than 15 data points. Thus, using the range rule of thumb, the range of a normally distributed data set is approximately four times the standard deviation. Thus, the range of the adult male foot length is as follows:Range = 4 × Standard deviation= 4 × 1.41 cm= 5.64 cmWe can then identify the limits separating values that are significantly low or high as follows:Significantly low values are cm or lower: 28.48 - 2 x 1.41 = 25.66 cmSignificantly high values are cm or higher: 28.48 + 2 x 1.41 = 31.3 cmThus, the adult male foot length of 31.6 cm is significantly high since it falls outside the range of values considered normal for adult male foot length.
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Write the coordinates of the vertices after a dilation with a scale factor of 3, centered at the origin. 10 B 10 0 10 А С 10 A(1, 2) A'l B(1, 3) - BC
Answer:
A'=(4,-8)
B'=(4,12)
C'=(-12, -12)
Step-by-step explanation:
Ad 3 to the location you are heading remember first is x then y so (x, y)
X is always left and right
Y is always up or down
When approximating Sºf(x)dx using Romberg integration, R33 gives an approximation of order: h10 h8 h4 h6 Romberg integration for approximating S. f(x)dx gives R21 = 7 and R22 = 7.21 then f(1) = 4.01 3.815 1.68 -0.5
Using Romberg integration, f(1) = 4.01.
Based on the given information, we can deduce the order of approximation for [tex]R_{33}[/tex] in Romberg integration as h10, h8, h4, h6. Additionally, we are given the values [tex]R_{21} = 7[/tex] and [tex]R_{22} = 7.21[/tex].
Romberg integration typically follows the pattern R(k, m), where k represents the number of iterations and m denotes the number of function evaluations per iteration.
From [tex]R_{21} = 7[/tex], we can determine that the approximation achieved after two iterations is 7.
From [tex]R_{22} = 7.21[/tex], we can conclude that the approximation achieved after two iterations is 7.21.
Since [tex]R_{21}[/tex] and [tex]R_{22}[/tex] represent the same number of iterations (k = 2), we can directly compare the results of these two approximations.
Therefore, the final answer is: f(1) = 4.01.
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Save Homework: Sanchez HW 4 Question , 4.5.39 Pat 34 HW Score: 0.005, 333 points O Points of 1 Complete and card deviation of doctor in the computer and concerts and round and your resu michewa Cost of Living Adjustments Data Obwodoma ) Comparative Stary Mean Standard 52175510 Deviation ed the compartimothes for wema) City Comparative - Say Om NY $16.00 Coors for the land setting percentage and women and CITY Housing Los - 20 Cost of living we City Comparative Housing Sutary OC 587 2105 saepe 187 Love Bone 0.00 229 SEL $50.04 - Nupo 38.000 eden 348.904 1411 Los 3807 New 567.50 245 Portu New Y 47 154570 17 37 15457 NY 49 0 Print Done?
The mean housing cost for the given cities is $20.42.
The standard deviation of housing costs for the given cities is 1.91.
The mean is calculated by summing up all the values in the dataset and dividing the sum by the total number of values. In this case, we have the following data for housing costs in different cities:
Comparative City Housing Cost
NY $16.00
Coors $20.00
Los Angeles $22.05
Santa Barbara $18.70
Oceanside $22.90
Porterville $20.50
New York $21.40
To calculate the mean, we add up all the values:
Sum = $16.00 + $20.00 + $22.05 + $18.70 + $22.90 + $20.50 + $21.40 = $141.55
Next, we divide the sum by the total number of values, which is 7 in this case:
Mean = $141.55 / 7 = $20.42
Therefore, the mean housing cost for the given cities is $20.42.
The standard deviation is a measure of the spread or variability in the dataset. It tells us how much the individual values deviate from the mean.
The formula for calculating the standard deviation is:
σ = sqrt[(Σ(x - μ)^2) / N]
Where:
σ is the standard deviation
Σ represents the sum of
x represents each individual value
μ is the mean
N is the total number of values
Using the given data, we substitute the values into the formula:
σ = sqrt[((16 - 20.42)^2 + (20 - 20.42)^2 + (22.05 - 20.42)^2 + (18.70 - 20.42)^2 + (22.90 - 20.42)^2 + (20.50 - 20.42)^2 + (21.40 - 20.42)^2) / 7]
Simplifying the expression within the square root:
σ = sqrt[(5.2364 + 0.0016 + 0.0264 + 2.7164 + 0.0524 + 0.0064 + 0.0064) / 7]
σ = sqrt[8.0456 / 7]
σ = sqrt(1.1494)
σ ≈ 1.07
Therefore, the standard deviation of housing costs for the given cities is approximately 1.07.
These calculations provide a measure of the average and spread of the housing costs across the different cities.
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A student took two national aptitude tests. The national mean and standard deviation were 475 and 100, respectively for the first test, and 40 and:8, respectively for me second test the studer scored 575 on the test and 60 on the second test. Uz scores to determine which earn the student performed better relative to the other testers:
a. first exam
b. second exam
Comparing the two z-scores, we can conclude that the student performed better relative to the other testers on the first exam because the z-score of 1 is closer to the mean (0) than the z-score of 2.5 on the second exam.
Given that the national mean and standard deviation were 475 and 100, respectively for the first test, and 40 and:8, respectively for the second test and the student scored 575 on the first test and 60 on the second test, we are to use z-scores to determine which exam the student performed better relative to the other testers.
A z-score is a numerical measure of a value's relationship to the mean of a group of values, measured in terms of the number of standard deviations from the mean. It can be calculated using the formula; z = (x - μ) / σ, where x is the value, μ is the mean, and σ is the standard deviation.
For the first exam;z-score = (x - μ) / σ = (575 - 475) / 100 = 1For the second exam;z-score = (x - μ) / σ = (60 - 40) / 8 = 2.5
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Given that a student took two national aptitude tests. The national mean and standard deviation were 475 and 100, respectively for the first test, and 40 and:8, respectively for me second test the student scored 575 on the test and 60 on the second test. The student performed better relative to other test-takers on the second test as the z-score of the second test is higher than the z-score of the first test.
In order to determine which test the student performed better on relative to other test-takers, we need to calculate the z-score for each test.
For the first test, the national mean is 475 and the standard deviation is 100.
The student's score is 575.
The z-score is calculated as:
z = (x - μ) / σ
z = (575 - 475) / 100
z = 1
For the second test, the national mean is 40 and the standard deviation is 8.
The student's score is 60.
The z-score is calculated as:
z = (x - μ) / σ
z = (60 - 40) / 8
z = 2.5
Since the z-score is a measure of how many standard deviations an observation is above or below the mean, a higher z-score indicates that the student performed relatively better compared to other test-takers.
Therefore, the student performed better relative to other test-takers on the second test as the z-score of the second test is higher than the z-score of the first test.
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26.2 miles in 4 hours. Find the unit rate
Answer:
Step-by-step explanation:
Unit rate = 26.2 ÷ 4 = 6.55