3 years ago

Please help me I need to get this right asap

Mathematics

1 answer:

lbvjy [14]3 years ago

8 0

Answer:

Step-by-step explanation:

You might be interested in

Why is one multiply by zero is answer zero

kiruha [24]

because if you multiply 3 by 0 its the same thing as saying 0+0+0 and that is still 0 (hope this was helpful)

7 0

3 years ago

Read 2 more answers

How many women must be randomly selected to estimate the mean weight of women in one age group? We want 90% confidence that the

ki77a [65]

Answer:

155 women must be randomly selected.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.9}{2} = 0.05$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.05 = 0.95$ , so Z = 1.645.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

The population standard deviation is known to be 28 lbs.

This means that $\sigma = 28$

We want 90% confidence that the sample mean is within 3.7 lbs of the populations mean. How many women must be sampled?

This is n for which M = 3.7. So

$M = z\frac{\sigma}{\sqrt{n}}$

$3.7 = 1.645\frac{28}{\sqrt{n}}$

$3.7\sqrt{n} = 1.645*28$

$\sqrt{n} = \frac{1.645*28}{3.7}$

$(\sqrt{n})^2 = (\frac{1.645*28}{3.7})^2$

$n = 154.97$

Rounding up:

155 women must be randomly selected.

4 0

3 years ago

125% of what number is 50?<br> 125% of is 50.<br> (Type a whole number.)

horsena [70]

Answer:

i thinkkk 40

if not my badd

4 0

3 years ago

If (w+13)^2=(3w+7)(2w+4), find w^2. Express your answer as a decimal.

faltersainse [42]

Answer: w² equals to 28.2

4 0

3 years ago

The area of a square is 100 m². What is its perimeter?

puteri [66]

Answer:

hope it helps you.........

7 0

3 years ago

Read 2 more answers