Atennis player wins a match 55% of the time when she serves first and 47% of the time when her opponent serves first. the player who serves first is determined by a coin toss before the match. what is the probability that the player wins a given match?

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?