The <em><u>correct answer</u></em> is:
c)75.4 to 94.6
Explanation:
The formula for a confidence interval is:
,
where μ is the mean, z is the z-score associated with the level of confidence we want, σ is the standard deviation, and n is the sample size.
Our mean is 85, our standard deviation is 12, our sample size is 6, and since we want 95% confidence, our z-score is 1.96:
<h3>
Answer:</h3>
<h3>
Step-by-step explanation:</h3>
We know that 
, so substitute that into the equation. 
With negative powers, instead of making the result negative, you divide one by it. Mathematically speaking, 
. This makes our equation: 
Finally, simplify the exponent. 
We can find the length of the sides now by dividing 56 by 4, which gives us 19. Subtracting 5 from 19 gives us our answer of 14 feet.
I got 3/8, hope this helps.
