For a package delivery business, historical data shows that delivery times follow a Normal distribution with mean 60 minutes and standard deviation 10 minutes. What sample size is needed so that the probability of the mean delivery time of a sample exceeding 65 minutes is at-most 1%? In other words, find the minimum value of n so that P(x > 60) < 0.01 n=20 On=23 On=22 On=21

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