A contractor must haul a large amount of dirt to a work site. She collected information from two hauling companies. EZ excavations gives its prices in a table. Happy Hauling Service gives its prices in a graph. How much would EZ Excavation charge to haul 40 cubic yards of dirt?

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?