THE CORRECT ANSWER IS (D). THE QUESTION DESCRIBES AN ARITHMETIC SE...

11. The correct answer is (D). The question describes an arithmetic sequence—an evenly

spaced, finite sequence of numbers. In any arithmetic sequence, the average of all terms

is the same as the median. The average is also equal to half the sum of the first and last

number in the sequence. Thus, either statement (1) or (2) alone suffices to answer the

question. For example, the sequence might include four integers {33, 35, 37, 39} or it

might include 6 integers {31, 33, 35, 37, 39, 41}. As you can see, regardless of the

number of terms, the average and median are each the same as half the sum of the least

and greatest terms.