Question: Problem 3.73 A computer disk drive is warranted to last at least 4,000 hours. The prob[1]ability that a disk drive lasts 4,000 or more hours

Problem 3.73 A computer disk drive is warranted to last at least 4,000 hours. The prob[1]ability that a disk drive lasts 4,000 or more hours equals 0.9999.

(a) Let X denote the number of disk drive failures during the warranty period. Describe the distribution of X; name it and identify the parameters.

(b) In a batch of 20,000 disk drives how many would be expected to fail before the warranty expired?

(c) What is the probability that three or more disk drives fail during the warranty period?

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