(MMC 5.18) Flixable reports that Netflix's U.S. catalog contains almost 4000 movies. You are interested in determining the average length of these movies. Previous studies have suggested the standard deviation for this population is 34 minutes. a. What is the standard deviation of the average length if you take a simple random sample of 25 movies from this population? b. How many movies would you need to sample if you wanted the standard deviation of to be no larger than 5 minutes?

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A: Given,standard deviation (σ)=16margin of error (E)=2α=1-0.88=0.12α2=0.06Z0.06 =1.5548

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