For the positive integers x, x + 2, x + 4, x + 7, and x + 22, the mean is how much greater than the median?  Choose the correct choice from the following answers
A) 0
B) 1
C) 2
D) 3
E) 7

Rationale: mean = ( x + x + 2 + x + 4 + x + 7 + x + 22 ) / 5 = ( 5 x + 35 ) / 5 = x + 7 median = x + 4 thus mean - median = x + 7 - ( x + 4 ) = 3 answer = d
Answer: D