Amovie theater sells all 250 tickets on a particular night. students can get discounted tickets half off the normal $20 price. how many students buy tickets if the movie theater receives $4000 total from all the tickets they sell on that specific night?

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?