The heights of 10 year old males are normally distributed with mean u=55.9 inches and a standard deviation of 0=5.7 inches. Determine the proportion of 10 year old males that are more than 53 inches tall. show calculator commands.

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?