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The Official Guide for GMAT Review
The Official Guide for GMAT Quantitative Review, 2nd Edition
2 Comments
Reader Comments (2)
Hi,
For the second approach. We don't need to add them all. Just use simple formular (a1+an)/2 = average.
(5+50)/2=27.5
Curtis,
Yes, that is correct. In general, for a uniformly spaced sequence:
Mean = Median = Average of First and Last Term = Average of 2nd and Second Last Term = etc....
However, if one knows that result then for this question no computation is required because one would immediately recognize that Mean - Median = 0
Dabral