January 16, 2009, was one of the coldest days in recorded history in the US. The temperature on the Big Black River in Maine was recorded at 50 degrees below zero Fahrenheit. How could you represent that temperature with an integer?

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?