The mean times for completion of tasks A and B are four and six hours respectively. A

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The mean times for completion of tasks A and B are four and six hours respectively. A particular project involves three tasks of type A and two of type B, all to be performed in succession. What is the expected time for completion of the project? Also, if the standard deviations for A and B are one and two hours respectively, and if all project times are independent, what is the standard deviation of the completion time?

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