City nail nas dimensions as shown in the figure below many gallons of paint must be bought in order to paint the monument? As
painted and that paint can be bought only by the gallon.
10 ft
gallons
46 ft
I
9 ft
9 ft

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?