Question: UTube, a video streaming platform conducted research on a sample of 200 videos and found that the average length of videos uploaded over the past

UTube, a video streaming platform conducted research on a sample of 200 videos and found that the average length of videos uploaded over the past 6 months was 45 minutes with a standard deviation of 0.1265 minutes. Determine the number of observations needed to be 80% confident that the estimate of the average video length is within 0.02 minutes of the overall mean video length. Note: Assume that the research standard deviation is a good estimate of the population standard deviation, that an appropriate value from the Z-table can be used, and that hand calculations are used to find the answer (i.e. do not use Kaddstat)

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