讨论：狗狗286

pancy5858 · 发表于 2010-1-21 02:40:02

286 DS: 一个数列由7个数字组成，最小的数字是1，问这个数列的range是否大于3？
(1) 7个数字的平均数是4
(2) 7个数字的中位数是3（有点模糊了）

选A, 想问为什么平均数是4, range就判断range大于3呢?

krazybon · 发表于 2010-1-21 03:47:10

cause there are 7 numbers, and the smallest number is 1, and average is 4, so set" 1,4,4,4,4,4,4" range would be 3, but average is lower than 4, therefore, one of the numbers must be greater than 4 to satisfy "average is 4" and range is then greater than 3

讨论：狗狗286

所属分类: GMAT考试

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