Imagine that you have a bag containing 10 marbles of different colors. you have drawn a marble, recorded its color and replaced it fifty times with the following results: 9 purple, 16 orange, 6, yellow and 19 green marbles, make a prediction for how many marbles of each color are in the bag.

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?