1. one morning you decide to purchase 300 shares of a stock at $6.31/sh. at the end of the day, you sell all of the shares for $8.24/sh. how much did you make or lose? one morning you decide to purchase 300 shares of a stock at $6.31/sh. what was gained or lost? 2. you decide to invest $5,200 into a stock worth $10.00/sh. you then sell the shares at $7.80/sh. how much did you lose?

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?