标题: 猴哥112难题第49题。If the average(arithmetic mean) of x, y, z, 5, and 7 is? [打印本页] 作者: primbo 时间: 2014-9-8 15:32:11 标题: 猴哥112难题第49题。If the average(arithmetic mean) of x, y, z, 5, and 7 is?
本帖最后由 primbo 于 2014-9-9 22:58 编辑
发现猴哥112难题里面的一道数量关系的错题。
If the average(arithmetic mean) of x, y, z, 5, and 7 is 8, which of the following must be true?
I The median of the five numbers cannot be 5.
II At least one of x, y, and z is greater than 9.
III The range of the five numbers is 2 or more.
给的答案是II and III
II没有问题,但是III不对啊。xyz中有一个肯定大于9,那么range肯定是大于等于4了,所以III说 2 or more 应该是不对的吧?就不可能是2.难道是我咬文嚼字了?