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3 years ago

I NEED HELP WITH NUMBER 7 I WILL GIVE BRAINLIEST HELP ME

Mathematics

2 answers:

amid [387]3 years ago

8 0

Answer:

x=16

Step-by-step explanation:

We need to times 4 for the bigger H.

4 x 4= 16

That means 16 is the width of the bigger h.

x=16.

Hope this helped!!! :D

MrRissso [65]3 years ago

4 0

Answer:

Hello! answer: x = 16

Step-by-step explanation:

5 × 4 = 20

4 × 4 = 16 so x = 16

Hope that helps!

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"a pollster wishes to estimate the number of left-handed scientists. how large of a sample is needed in order to be 98% confiden

nadezda [96]

The sample size should be 250.

Our margin of error is 4%, or 0.04. We use the formula

$\text{ME}=z\sqrt{\frac{\hat{p}(1-\hat{p})}{n}}$

To find the z-score:
Convert 98% to a decimal: 0.98
Subtract from 1: 1-0.98 = 0.02
Divide both sides by 2: 0.02/2 = 0.01
Subtract from 1: 1-0.01 = 0.99

Using a z-table (http://www.z-table.com) we see that this value has a z-score of approximately 2.33. Using this, our margin of error and our proportion, we have:

$0.04=2.33\sqrt{\frac{0.08(1-0.08)}{n}}
\\
\\0.04=2.33\sqrt{\frac{0.08(0.92)}{n}}$

Divide both sides by 2.33:
$\frac{0.04}{2.33}=\sqrt{\frac{0.08(0.92)}{n}}$

Square both sides:
$(\frac{0.04}{2.33})^2=\frac{0.08(0.92)}{n}$

Multiply both sides by n:
$(\frac{0.04}{2.33})^2n=0.08(0.92)$

Divide both sides to isolate n:
$\frac{0.08(0.92)}{(\frac{0.04}{2.33})^2}=n
\\
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3 years ago