The arithmetic mean and standard deviation of a certain normal distribution are 14.0 and 1.5, respectively. What value is exactly 2 standard deviations less than the mean?
Select the correct option.
A) 10.5  B) 11  C) 11.5  D) 12  E) 12.5

Rationale: "the value which isexactlytwo sd less than the mean is : mean - 2 * sd = 14.0 - 2 * 1.5 = 11 . answer : b ."
Answer: B