(Answered) The times that a cashier spends processing each persons

Statistics

The times that a cashier spends processing each person's order have mean 4 minutes and standard deviation 2.5 minutes. What is the approximate probability that it will take more than 7 hours to process the orders of a random sample of 100 people? Find the number of customers n such that the probability that the orders of all n customers can be processed in less than 2.5 hours is approximately .025. Please help with this question.

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