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Determine the standard deviation of t

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Question: Suppose the length of time a person takes to use an ATM machine is normally distributed with mean μ = 100 seconds and standard deviation σ = 10 seconds. There are n = 4 people ahead of Jackson in a line of people waiting to use the machine. He is concerned about T = total time the four people will take to use the machine.

a. What is the mean value of T = total time for the four people ahead of Jackson?

b. Assuming that the times for the four people are independent of each other, determine the standard deviation of T.

Reference no: EM131727402

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