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GRE junior high school math problem: Knowing the average and median of two series, how to find the average and median of another series?
Average value = (85*20+75*30)/(20+30) = 79.
The median is uncertain because it is uncertain how much half of the series 1 that is less than the median 80 is less than the median 72 of the second series, for example, {8 170, 102, 80, 2 79, 8 0} or {8 170,/kloc.