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单选题
If the average (arithmetic mean) of 3, 7, 10, and x is 7, then what is the median of 3,7,10, and x?
A

5.5

B

6

C

6.5

D

7

E

7.5

参考答案

参考解析
解析：
因为3,7,10,和x 的平均数是7，可得出等式(3+7+10+x)/4=7，(20 + x)/4= 7，20+ x = 28，x = 8。所以3,7,10,和x四个数排序为3,7,8,10，它们的中位数为(7+8)/2=7.5。
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