Which is correct and why?
1. amelia is correct because 77+x=115
2.leo is correct because 77+x=115
3. amelia is correct because x=77+115
4.leo is correct because x=77+114

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?