Determine t so that the probability that the repair person in Self-Test Problem1 finishes the 20 jobs within time t is approximately equal to .95.
Problem1
The servicing of a machine requires two separate steps, with the time needed for the first step being an exponential random variable with mean .2 hour and the time for the second step being an independent exponential random variable with mean .3 hour. If a repair person has 20 machines to service, approximate the probability that all the work can be completed in 8 hours.
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