Westford Photography Studio is taking graduation portraits for students at local schools. Eighth graders from Westford Elementary School ordered 74 basic portrait packages and 62
deluxe portrait packages, for a total of $10,464. The seniors at Newberry High ordered 63
basic portrait packages and 74 deluxe portrait packages, for a total of $10,818. How much
does each type of package cost?

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?