Game. Tina also worked out the total number of points scored by the 16 students in the
Here is her working.
(0 x 1) + (1 x 3) + (2 X 5) + (3 x 4) +(4 x 3) = 1 + 3 + 10 + 12 + 12 = 38
Tina made a mistake in her working to find the total number of points scored.
(b) Describe the mistake that Tina made.

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?