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faust18 [17]
3 years ago
14

Everyone if you can help that would be great

Mathematics
1 answer:
Katyanochek1 [597]3 years ago
6 0

Answer:

the answer is 2.87

Step-by-step explanation:

use the pythagorean theorem

2^2+b^2=4^2

that goes to b= 3.5

for the triangle with x you also need to use the pythagorean theorem

2^{2}+x^{2}=3.5^{2}

4+x^{2}=12.25

subtract 4 on both sides

x^{2}=8.25

\sqrt{x}=\sqrt{8.25}

x=2.87

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Step-by-step explanation:

  1. subtracting 1 from sample size: 83-1= 82
  2. Note Mean=21.5 and standard deviation=2.5
  3. Subtracting confidence interval from 1 and dividing by 2: (1-0.95)/2=0.025
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Answer:

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