A P/OM student has purchased a four-function calculator for use during exams.This calculator is perfectly reliable except for two parts: its microchip,which has a failure rate of one in every twenty hours of operation; and its battery,which has a failure rate of one in every ten hours of operation.Also,on average the battery will fail in five hours,with a standard deviation of 30 minutes.Assuming that a new battery has just been installed and the student brings one spare battery with him,what is the probability that the calculator will perform reliably during a one-hour exam?
A)0.89775
B)0.9405
C)0.987525
D)0.99
E)0.9975

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The Answer of A P/OM student has purchased a four-function calculator for use during exams.This calculator is perfectly reliable except for two parts: its microchip,which has a failure rate of one in every twenty hours of operation; and its battery,which has a failure rate of one in every ten hours of operation.Also,on average the battery will fail in five hours,with a standard deviation of 30 minutes.Assuming that a new battery has just been installed and the student brings one spare battery with him,what is the probability that the calculator will perform reliably during a one-hour exam?
A)0.89775
B)0.9405
C)0.987525
D)0.99
E)0.9975

A P/OM Student Has Purchased a Four-Function Calculator for Use