3 A graphic designer made a scale computer-model of a poster in which 5 inches represents 4 feet. The actual width of the poster is 18 feet. What is the width in inches
of the computer-model poster?
A 4.5 in.
B 20 in.
C 22.5 in.
D 14.4 in.

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?