In a bin containing 500 marbles, 180 are red, 240 are blue, and 80 are green. in a bowl of 25 marbles scooped from this bin, how many would be expected to be green? a. 4 b. 8 c. 9 d. 12

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?