The process of being served at a bank consists of two independent parts-the time waiting in line and the time it takes to be served by the teller. Suppose that the time waiting in line has an expected value of 4 minutes, with a standard deviation of 1.2 m

The process of being served at a bank consists of two

independent parts-the time waiting in line and the time it

takes to be served by the teller. Suppose that the time waiting

in line has an expected value of 4 minutes, with a standard

deviation of 1.2 minutes, and the time it takes to be

served by the teller has an expected value of 5.5 minutes,

with a standard deviation of 1.5 minutes. Compute the

a. expected value of the total time it takes to be served at

the bank.

b. standard deviation ofthe total time it takes to be served at

the bank