Customers come to a barber shop with the frequency of 3 per

Customers come to a barber shop with the frequency of 3 per hour. Suppose Y4 is the time when the 4th customer has come.

a) Find the expected value and the standard deviation.

b) Find the probability that the fourth customer comes within the 1st hour

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Customers come to a barber shop with the frequency of 3 per : customers come to a barber shop with the frequency of 3 per hour. suppose y4 is the time when the 4th customer has

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