Question

It is generally recognized as wise to back up computer data. Assume that there is a

4​%

rate of disk drive failure in a year.

a. If all of a​ computer's data are stored on a single hard disk​ drive, what is the probability that the drive will fail during a​ year?

b. If all of a​ computer's data are stored on a hard disk drive with a copy stored in a second hard disk​ drive, what is the probability that both drives will fail during a​ year?

c. If all of a​ computer's data is stored on three independent hard disk​ drives, what is the probability that all three will fail during a​ year?

d. Describe the improved reliability that is gained with backup drives.

Answer 1

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