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The Department of Motor Vehicles receives complaints about customers having to wait too long at their offices.They collect data and find the average wait time

The Department of Motor Vehicles receives complaints about customers having to wait too long at their offices.They collect data and find the average wait time is 35 minutes with a standard deviation of 10 minutes.Assume that wait times are Normally distributed.

a) Find the probability that a randomly selected customer has to wait less than 30 minutes.

b) Find the probability that an SRS of 40 customers has a mean weight time less than 30 minutes.

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