Question: A manufacturing project has five independent phases whose completion must be sequential. The time to complete each phase is a random variable. The mean and

A manufacturing project has five independent phases whose completion must be sequential. The time to complete each phase is a random variable. The mean and standard deviation of the time for each phase are shown below.

PhaseMean (hours)Std. Dev. (hours)Set up dies and other tools254Milling and machining114Finishing and painting142Packing and crating45Shipping495

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(a)Find the expected completion time.

The expected completion timehours

(b)Make a 2-sigma interval around the mean completion time.(Round your answers to 1 decimal place.)

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