The equation a(s) = 37.55 - 1.5s2 models the function represented in the table. Fill in the blank to complete
the restricted domain of the function. HELP IM BEING TIMED PLEASE

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?