请教一道题

li43119 · 发表于 2011-7-11 10:50:03

a student worked for 20 days, for each of the amounts shown in the first row ,the second row gives the number of days that the student earned that amount. what is the median amount of money that the student earned per day for the 20 days.
row1: 96, 84,80,70,48
row2:4 ,7 , 4 , 3,2
选项是A、96 B、84 C、80 D、70 E、48

bitsera · 发表于 2011-7-11 11:00:30

D 对么

li43119 · 发表于 2011-7-11 11:04:24

是B

li43119 · 发表于 2011-7-11 11:06:13

没看明白这个答案

bitsera · 发表于 2011-7-11 11:07:03

那我理解错了等牛人解答

li43119 · 发表于 2011-7-11 11:08:28

我自己选的也是D

li43119 · 发表于 2011-7-11 11:09:23

模考的题，只有答案，没有解释，琢磨了半天。

ike982003 · 发表于 2011-7-11 11:09:41

这组数列中有4个96，7个84,4个80,3个70,2个48，将其从小到大排列，找出中间的数即可。
可以得到要求的是第10和11的平均数，即84和84的平均数，所以是84选B

li43119 · 发表于 2011-7-11 11:14:48

懂了。多谢！

li43119 · 发表于 2011-7-11 11:22:10

all of the stocks on the over-countermarket are designated by either a 4-letter or 5-letter code that is created by using the 26 letters of alphabet. which of the following gives the maximum number of different stocks that can be designated with these codes?
答案是：27（26^4）

请教一道题

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