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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 an SRS of 25 movies from this population? (b) How many movies would you need to sample if you wanted the standard deviation of a to be no larger than 5 minutes?
Sagot :
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