Warm-up
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Question 4
VCMS has 713 students. Johnny surveys a random sample of 34 students and finds that 9 of them play a musical instrument.
How many students at the school are likely to play a musical instrument?
Your
704
525
209
188
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2020

Assume that there is a 11% rate of disk drive failure in a year. a. if all your computer data is stored on a hard disk drive with a copy stored on a second hard disk drive, what is the probability that during a year, you can avoid catastrophe with at least one working drive? b. if copies of all your computer data are stored on four independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?