Plz help I've been crying about this question about number 8 plz help with number 8 I'll give brainiest.

The best estimate of the standard deviation of the population is 75

The given parameter is:

Sample size, n

The estimate of the standard deviation of the population is calculated using:

[tex]\sigma_x = \frac{\sigma}{\sqrt n}[/tex]

This gives

[tex]\sigma_x = \frac{\sigma}{\sqrt 25}[/tex]

Evaluate the square root

[tex]\sigma_x = \frac{\sigma}{5}[/tex]

Multiply both sids by 5

[tex]\sigma = 5\sigma_x[/tex]

From the normal curve, we have:

[tex]\sigma_x = 15[/tex] -- the difference between the scores

So,we have:

[tex]\sigma = 5 * 15[/tex]

[tex]\sigma = 75[/tex]

Hence, the estimate of the standard deviation of the population is 75

Read more about standard deviation at:

https://brainly.com/question/15858152

Answer:

See attachment for plot

Step-by-step explanation:

Given

[tex]y =2x[/tex]

[tex]R =+2[/tex] --- increment in the rate

First, we need to model the new rate

A linear equation is:

[tex]y = mx + b[/tex]

Where

[tex]m = rate[/tex]

Compare [tex]y =2x[/tex] and [tex]y = mx + b[/tex]. we have:

[tex]m =2[/tex]

The above represents the previous rate.

The new rate:

[tex]R =+2[/tex]

Rewrite as:

[tex]R = m+2[/tex]

[tex]R = 2+2[/tex]

[tex]R = 4[/tex]

So, the model is:

[tex]y = Rx[/tex]

[tex]y = 4x[/tex]

The plot at 1 and 2 minutes

When [tex]x = 1[/tex]

[tex]y = 4x = 4 * 1 = 4[/tex]

When [tex]x = 2[/tex]

[tex]y = 4x = 4 * 2 = 8[/tex]

So, we have:

[tex](x_1,y_1) =(1,4)[/tex]

[tex](x_2,y_2) =(2,8)[/tex]

Whether she moves backwards or forward, the distance covered remains the same

See attachment for plot

Answer:

it's in the link on the other comment

Step-by-step explanation:

it's in the link on the other comment

Answer:

66 2/3

Step-by-step explanation:

Let x be the length of the first side

Length of first side: x

Length of second side: 2x

Length of third side: x + 40

x + 2x + x + 40 = 240

3x = 240-40

3x = 200

x = 200/3

x = 66 2/3 (this is a mixed fraction)

Answer:

120 m

Step-by-step explanation:

Width - x

Length - 5x

x*5x = 500m²

5x² = 500 m²

x²= 500 ÷ 5

x²= 100

x = root 100

x = 10

Therefore width = 10

length 5*10 = 50

Perimeter = 2(l+w)

= 2(10 + 50)

=2*60

=120

The answer is D, always remember SOH CAH TOA :)

Answer:

360 cm^3

Step-by-step explanation:

Since the height of the block must be 6cm, and the length is 10cm, and the depth is 6cm, the volume must be 6 * 10 * 6 = 360cm^3

Answer:

I think it is B

Step-by-step explanation:

Sorry if it is wrong

The probability that the person and his friends are chosen is  5/35, the correct option is B.

Probability is the likeliness of an event to happen.

There are 7 people (including you and your friend) in the front row.

The host randomly chooses 3 people from the front row to be contestants.

The ways that you both will be chosen is given by  ²C₂

The ways in which one more person will be chosen from the rest 5 people  is given by

⁵C₁

The number of ways in which the person and his friend is chosen along with the other one person is given by

⁵C₁ * ²C₂ = 5

The ways in which 3 contestants will be chosen from 7 people is 35

So, Probability = 5/35

To know more about Probability

https://brainly.com/question/11234923

#SPJ5

Answer: 154 sq cm

Step-by-step explanation:

Answer:

It's:

y = [tex]-\frac{1}{2}x + 1[/tex]

y = -2x - 4

Hope this helps!

Answer:

m= 0.3

Step-by-step explanation:

10.1 = 8 + 7m

-8     -8

2.1 = 7m

2.1/7 = 0.3

Answer:

Subtract  8  from both sides of the equation

Simplify

Divide both sides of the equation by the same term

m=0.3

Answer:

B.   A = 119.1 in.²

Step-by-step explanation:

A = area of trapezoid - area of circle

A = ½(b1 + b2)h - πr²

A = [½(27 + 12)(14) - 3.14159(7²)] in.²

A = 119.1 in.²

Answer:

7.8 years

Step-by-step explanation:

Formula

[tex]PV(1+\frac{i}{n})^{nt}[/tex]

we have

[tex]2900(1+\frac{.09}{4})^{4t}=5800\\1.0225^{4t}=2\\4t=log_{1.0225}2\\4t=31.1518\\t=7.787957[/tex]

Which rounds to

7.8

Answer: 45.

Step-by-step explanation:

Answer:

80% of 100 in fraction form is 4/5

Step-by-step explanation:

Answer:

he went 0.2km south

Step-by-step explanation:

Answer:

He went 0.2km south.

Step-by-step explanation:

Your welcome!

Answer:

The estimate of the proportion of people who pass out at more than 6 Gs is 0.279.

Step-by-step explanation:

Estimate of the proportion of people who pass out at more than 6 Gs.

Number of people who passed out divided by the size of the sample.

We have that:

Sample of 502 people, 140 passed out at G forces greater than 6. So the estimate is:

[tex]p = \frac{140}{502} = 0.279[/tex]

The estimate of the proportion of people who pass out at more than 6 Gs is 0.279.

Hi there!

[tex]\large\boxed{x = 3.6}[/tex]

We can use the Pythagorean theorem to solve, where:

CT² = CP² + PT²

Thus:

CT² = 5² + 7²

CT² = 74

CT = √74 = 8.60

To solve for x, we must subtract the radius from CT to solve:

x = CT - 5

8.6 - 5 = 3.6

Answer:55

Step-by-step explanation:

Answer:

a,d,e and f and number greater than or equal to 100.

Answer:

It's DEFINITELY 2.52

Step-by-step explanation:

Change 6% to a decimal, which will be .06! Times $42 Times.06 and you'll end with the answer $2.52 !!!

Answer:

97.5% of newborn babies born in the maternity wing of this hospital can be expected to have birth weight greater than 2250 grams.

Step-by-step explanation:

The Empirical Rule states that, for a normally distributed random variable:

Approximately 68% of the measures are within 1 standard deviation of the mean.

Approximately 95% of the measures are within 2 standard deviations of the mean.

Approximately 99.7% of the measures are within 3 standard deviations of the mean.

The normal distribution is symmetric, which means that 50% of the values are below the mean and 50% are above.

In this problem, we have that:

Mean of 3300, standard deviation of 525.

What percent of newborn babies born in the maternity wing of this hospital can be expected to have birth weight greater than 2250 grams?

2250 = 3300 - 2*525

2250 is 2 standard deviations below the mean.

Of the 50% of the weights below the mean, 95% are going to be greater than 2250(less than 2 standard deviations of the mean).

Of the 50% of the weights above the mean, 100% are going to be greater than 2250.

So

[tex]p = 0.5*0.95 + 0.5 = 0.975[/tex]

0.975*100% = 97.5%

97.5% of newborn babies born in the maternity wing of this hospital can be expected to have birth weight greater than 2250 grams.

Answer:

x² - y²

Step-by-step explanation:

√x⁴ =x²

= x² - y²

Answer:

C. 248 square meters

Step-by-step explanation:

2(10 x 6) + 2(10 x 4) + 2(6 x 4)

= 120 + 80 + 48

= 248 [tex]m^2[/tex]

Answer:

c. 248

Step-by-step explanation:

2(6×4 + 10×4 +10×6) = 248

Answer:

soda = 10

burger = 5

fries = 2

5 + 2 x 10 = 25

Step-by-step explanation:

brainliest?

Answer:

Step-by-step explanation:

70 115 180-25

Answer:

the probability is here down hope you will see

Answer:

Step-by-step explanation:

180 = x + 135 + x + 65

-20 = 2x

-10 = x

x = -10

GF = 55°