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Confidence interval for the average length of a box

A previous analysis of paper boxes showed that the the standard deviation of their lengths is 13 millimeters. A packer wishes to find the 95% confidence interval for the average length of a box. How many boxes does he need to measure to be accurate within 4 millimeters?

A. 11

B. 58

C. 41

D. 29

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## Q : Mean-variance and standard deviation for x

Let X denote the amount in pounds of polyurethane cushioning found in a car. The density for X is given by: f(x)=(1/in2)(1/x) 25? x? 50. Find the mean, variance, and standard deviation for x.