Ascale model of an airplane has a wingspan of 8 inches ( in real life, the same airplane has a wingspan of 32 feet (ft). what is the scale of the model to real life?

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?