求证两道数学题 GWD 22

lxw19

Q15:
The average (arithmetic mean) of a list of numbers is what percent of the sum of the numbers?
(1)There are 8 numbers in the list.
(2) The sum of the numbers in the list is 100.

答案选A，我选C

Q17:
If 0 < r < 1 < s < 2, which of the following must be less than 1?


I.r/s
II.rs
III.s - r




A.I only

B.II only
C.III only

D.I and II

E.I and III

答案选A，我选D

lxw19

顶下

maximeason

第一题问你  averge和总数的比 知道个数就足够了啊 8倍嘛~
第二题 你带了个数就出来了 很简单