To prepare for his camping trip, emanuel filled his canteen with water. is 15,000 millimeters or 1,500 millimeters a more reasonable estimate for the amount of water in the canteen? explain i need

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?