Joni, who is 5 feet tall, is walking to her office
building which she knows is 150
ft high. The angle to the top of
the building from the top of her
head is 6º. How much further
does she need to walk?

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?