136.
x, 3, 1, 12, 8
If x is an integer, is the median of the 5 numbers shown greater than the average (arithmetic mean) of the 5 numbers?
(1) x > 6
(2) x is greater than the median of the 5 numbers.
答案 E
请教思路,谢谢
条件2包含条件1,由条件2知:x的位置应该是1,3,8,x,12,or 1,3,8,12,x,即x>8,最
小可以是9。
(1+3+8+x+12)/5>=(1+3+8+9+12)/5,即>=33/5,题目要求的是the median (8) is
greater than the average, 33/5不符合条件,所以条件1和2都不满足。
8>33/5啊,为什么不符合呢?
继续求教
谢谢
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