谁能帮我看看这道GMATPrep里的题

遇到中数问题必错, 谁能帮忙讲讲就算救了我的命了.先谢过!

分数            人数

50-59           2

60-69          10

70-79           16

80-89          27

90-99          18

The table above shows the distribution of test score for a group of management trianees, which score interval contains the median of the 73 score?

A 60-69

B 70-79

C 80-89(答案)

D 90-99

E none

是不是太简单了, 大家都懒得做呀?