the senior class is having a Halloween dance for fundraiser each person attending will get a bag of candy and one soft drink the DJ will cost 325 and it will cost a dollar 75 for supplies for each person the tickets will sell for $5 how many people will have to attend the dance for the seniors break even

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?