# Question

A certain outpatient medical procedure has five steps that must be performed in sequence.

(a) Assuming that the time (in minutes) required for each step is an independent random variable, find the mean and standard deviation for the total time.

(b) Why might the assumption of independence be doubtful?

(a) Assuming that the time (in minutes) required for each step is an independent random variable, find the mean and standard deviation for the total time.

(b) Why might the assumption of independence be doubtful?

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