Amy Walters at an animal shelter she worked 10 hours in March 2000 hours in April 14 hours in May and $60 in June if the pattern continues how many hours will she work in December I need a answer asap​

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?