Which statement is true? the numbers on a horizontal number line are oriented from right to left. the numbers on a vertical number line are oriented from top to bottom. the numbers on a horizontal number line are oriented from left to right. the numbers on a vertical number line are oriented from right to left.

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?