GMAT
题目
The scores on a certain exam were 60, 75, 100, 70 and x. If the median score was 5 points lower than the average (arithmetic mean) score on the exam, which of the following could be x?
解析
先看可选的选项：
\(x\)的取值范围看起来是\(75 \leq x \leq 95\)
选项：
A. 75
B. 80
C. 85
D. 90
E. 95
所以\(x\)的位置是第4位，数列排列为：60，70，75，\(x\)，100
该数列的中位数 = 75
已知中位数比平均数低5分，因此平均数 = 80
数列总和为：\(60 + 70 + 75 + x + 100 = 400\)
解得：\(x = 95\)
答案：E
在线客服
官方微信
公众号