A certain set of numbers has an average (arithmetic mean) of 10 and a standard deviation of 2.5. If X, a number in the set, is within 2 standard deviations from the average, then which of the following CANNOT be the value of X?
Pick one:	A) 2	B) 5.5	C) 6	D) 10	E) 14
average (arithmetic mean) of 10 and a standard deviation of 2.5   Since, X, a number in the set, is within 2 standard deviations   i.e. X, a number in the set, between 10+2*2.5 and 10-2*2.5   i.e. X, a number in the set, between 15 and 5   Option 2 (2) is not within 2 SD therefore   2nswer: Option 2
<result>A</result>
A certain set of numbers has an average (arithmetic mean) of 10 and a standard deviation of 2.5. If X, a number in the set, is within 2 standard deviations from the average, then which of the following CANNOT be the value of X?