In front of a store, there is a row of parking spaces. Cars park parallel to one another, with the front of each car facing the store. Currently there are 10 compact spaces and 12 full size spaces. The store owners think they can repaint in the same space to fit 16 compact spaces and 9 full size spaces. The width of each type of space will not change. Are the store owners correct? Explain.

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?