The time spent by a customer at a checkout counter has mean 4 minutes and standard
Chapter 4, Problem 7(choose chapter or problem)
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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