Statement (1) tells us the smallest number, but not how many numbers are in the list. It is not
sufficient. Cross off A and D.
Statement (2) tells us the value of n, so the question becomes: What is the average of a list of
8 consecutive integers? Since those integers can be large, small, or even negative, we have no way
to tell what the average is. Statement (2) is not sufficient, so we can eliminate B.
Now let’s put the two statements together. If we know that 5 is the smallest number in a list of
8 consecutive numbers, then we can easily reconstruct the list and find the average. So the statements
are sufficient when put together, and the answer is C.