Answer:
The height of the second cylinder is 30mm
Step-by-step explanation:
Given
Cylinder 1:
Cylinder 2
See attachment
Required
Determine h, the height of the small one
To do this, we make use of the following equivalent ratios;
This gives:
Express as fraction
Simplify
Cross multiply
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: