The arithmetic mean and standard deviation of a certain normal distribution are 14.5 and 1.5, respectively. What value is exactly 2 standard deviations less than the mean?
Select:
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 = 14.5 - 2 * 1.5 = 11.5 . answer : c ."
Answer: C