Question

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

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.

Math   Statistics-And-Probability   
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