nevaeh has $560 to spend at a bicycle store for some new gear and biking outfits. Assume all prices listed including tax. She buys a new bicycel for $383.32She buys 4 bicycle reflectors for $9.09 each and a pair of bike gloves for $21.07She plans to spend some or all the money she has left to buy new biking outfits for $39.75 each.

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?