Your friend invites you to a movie, saying that it starts on either saturday or sunday. she also says that there are 4 showings on each of those days. what is the probability that you watch the movie during the third showing on saturday? write your answer as a percent.

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?