A recipe for 12 baked chocolate chip cookies calls for 2 cups of flour to 0.75 cups of semi-sweet chocolate chips. What is the ratio of flour to chocolate chips for 36 baked chocolate cookies?

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?