黄皮SEC 69 (P142) 28题It is the average of x,y z, 5 ,and 7 is 8
which of the following must be true?
a) the median of the 5 numbers cannot be 5
b) at least one of x y and z us greater than 9
c) The range of the 5 numbers is 2 or more
主要是c这个选项的range 不太懂是什么意思 是不是理解成数值的差?
然后这一题的答案黄皮给的是 b c 两个是对的
而我看网上的新东方勘误表说只有b 是对的 到底c对不对呢?
谢谢各位解答~