Anna's bedroom is in the shape of a right rectangular prism. The floor has an area of 120 square feet. The walls are 8ft high. What is the volume of Anna's bedroom? A. 15 cubic feet
B. 128 cubic feet
C. 960 cubic feet
D. 7680 cubic feet

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?