A manufacturer of hard drives knows that the average life of a hard drive is five years with a standard deviation of one year. If he only wants to warranty the drive for three years, what proportion of hard drives should he expect to replace? Assume the normal distribution.© BrainMass Inc. brainmass.com June 3, 2020, 9:35 pm ad1c9bdddf
Solution. Let X be the life of a hard drive. By the given information, we know that X follows a normal distribution with mean 5 years and a standard deviation of one year. If he only wants ...
This solution consists of a detailed explanation of computing a probability of a normal distribution.