Does read theory have answers keys ?

Which database model is best used for data warehouse and data mining

Assume that there is a 4% 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 three independent hard disk drives, what is the probability that during a year, you can avoid catastrophe with at least one working drive?

After you clean an engine with hot water spray, it seems to stall; when it doesn't stall, it's idling noisily. technician a says to check for loose bolts on the flex plate near the torque converter. technician b says to wipe down the spark plug wires and the distributor cap. who is correct? a. technician a b. both technicians a and b c. technician b