Brainliest if first answerPaul expects to sell four out of every five brownies he bakes. He thinks, “I will only sell four out of five brownies, so I need to bake more brownies than I want to sell. I want to earn $10 in total. I need to know how many brownies to bake." Complete Paul's explanation, and solve the problem.

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?