Sierra runs a factory that makes DVD players each T 50 makes 9 ounces of plastic and 4 ounces of metal HFS 20 requires 3 ounces of plastic and 6 ounces of metal the factory has 276 ounces of plastic 384 ounces of metal available with a maximum of 18 T 50 that can be built each week if HT 50 generates $11 and profit and each F S 20 generates seven dollars how many of each of the DVD players should sierra have the factory make each week to make the most profit

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?