Assume that there is a 55% 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 threethree independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive? a. with two hard disk drives, the probability that catastrophe can be avoided is nothing. (round to four decimal places as needed.) b. with threethree hard disk drives, the probability that catastrophe can be avoided is nothing. (round to six decimal places as needed.)