Question: 7.23 Refer to Exercise 7.21. The random variable Y1 Y2 represents the time spent at the service window. a Find E(Y1 Y2). b

7.23 Refer to Exercise 7.21. The random variable Y1  Y2 represents the time spent at the service window.

a Find E(Y1  Y2).

b Find V(Y1  Y2).

c Is it highly likely that a customer would spend more than 2 minutes at the service window?

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