Suppose a normal distribution has a mean of 12 and a standard deviation of 4. a value of 18 is how many standard deviations away from the mean? a. −2 b. −1.5 c. 1.5 d. 2

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?

If f (x) = 2x2 +5/(x-2), complete the following statement: f(6) =

Benefit(s) from large economies of scale, in which the costs of goods decrease as output increases. natural monopolles perfect competition