Question: The time spent by a customer at a checkout counter has mean 4 minutes and standard deviation 2 minutes. a. What is the probability that

The time spent by a customer at a checkout counter has mean 4 minutes and standard deviation 2 minutes.

a. What is the probability that the total time taken by a random sample of 50 customers is less than 180 minutes?

b. Find the 30th percentile of the total time taken by 50 customers.

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