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A repairman has 20 jobs that need to be completed today. Usually, 70% of all jobs...

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Basic Math

A repairman has 20 jobs that need to be completed today.Usually, 70% of all jobs are fairly straightforward, so that thetime it takes to complete them is well-described by normaldistribution with average 10 minutes and standard deviation 1minute. The rest are challenging jobs, so that completion time iswell-modeled with exponential distribution with average 1 hour.

i. If she starts at 8am, what is the expected time when she willfinish all already assigned jobs?

ii. When asked when she will finish the jobs, she wants to givea safe answer by overestimating it by one standard deviation. Findthe standard deviation for the time needed to finish all jobs.

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