Suppose a normal distribution has a mean of 49 and a standard deviation of 5. What is the probability that a data value is between 48 and 52? Round your
answer to the nearest tenth of a percent.

O A. 31.1%
O B. 28.8%
O C. 26.2%
O D. 30.5%

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?