急救-数学中位数解答-明天考了

Paul050864UID: 2788211

A group of students were tested on data-entry skills, and the number of errors they made and the percent of students making x errors were recorded as follows.

　　

Number of errors
       

Percent of students

0
       

1%

1
       

7%

2
       

8%

3
       

25%

4
       

19%

5
       

18%

6 or more
       

22%



　　1. What is the range for the number of errors made by the students in the sample?

　　A. 4

　　B.5

　　C.6

　　D.7

　　E. It cannot be determined from the information given.

　　2. What was the median number of errors in the sample?

　　A.3

　　B.3.5

　　C.4

　　D.4.5

　　E. It cannot be determined from the information given.

能解释下吗？我认为两题都是选E，我朋友说不是，你们呢？？

Paul050864UID: 2788211

大侠们求解下吧，我自己先顶一个，急啊

Paul050864UID: 2788211

此题是 张雷东 数学讲义的例18，但是可恶的是那个讲义没给答案啊，解没解释

inapUID: 3033165

E,C
中位数是把序列从小到大排好序后，中间的那个——即出于50%位置的数。41%-60%区间是4，所以中位数（50%位置）也是4.

Paul050864UID: 2788211

inap 发表于 2012-10-2 22:21
E,C
中位数是把序列从小到大排好序后，中间的那个——即出于50%位置的数。41%-60%区间是4，所以中位数（50 ...

好，谢谢，我已经考完，我已经分享寂静