Suppose a police officer is 1/2 mile south of an intersection, driving north towards the intersection at 50 mph. At the same time, another car is 1/2 mile east of the intersection driving east (away from the intersection) at an unknown speed. The other's radar gun indicates 3 mph
when pointed at the other car that is the straight-line distance berween the otficer and the other car is increasing at a rate of mph). What
is the speed of the other card

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?