一道英国的数学题7 The times in minutes taken by 11 people to wait to be served at a supermarkcheckout are listed in order:1,1,2,3,3,3,4,5,5,6,8(a) Find:(i) the lower quartile..(ii) the interquartile range..

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一道英国的数学题7Thetimesinminutestakenby11peopletowaittobeservedatasupermarkcheckoutarelistedinorder:1,1,2,

一道英国的数学题7 The times in minutes taken by 11 people to wait to be served at a supermarkcheckout are listed in order:1,1,2,3,3,3,4,5,5,6,8(a) Find:(i) the lower quartile..(ii) the interquartile range..
一道英国的数学题
7 The times in minutes taken by 11 people to wait to be served at a supermark
checkout are listed in order:
1,1,2,3,3,3,4,5,5,6,8
(a) Find:
(i) the lower quartile
.
.
(ii) the interquartile range
.
.

一道英国的数学题7 The times in minutes taken by 11 people to wait to be served at a supermarkcheckout are listed in order:1,1,2,3,3,3,4,5,5,6,8(a) Find:(i) the lower quartile..(ii) the interquartile range..
先把题翻一遍吧,)
11个人在超市等待服务的分钟数列于下：
1,1,2,3,3,3,4,5,5,6,8
(a)找到：
(i)较小的四分位数
(ii)四分位数间域（呵呵,我不知道这个词对应的中文是什么,就自己给起了个名字）
其实就是几个概念的问题：
首先,quartile,也就是四分位数的概念.这个是指能将你的一个数列按照中位数分成四份的三个数,求法如下：
1、先求中位数,对你的数列来说是第六个数,也就是3,记为Q2
2、对中位数Q2左边的数列求中位数,对你的数列来说是第三个,也就是2,记为Q1
3、对中位数Q2右边的数列求中位数,对你的数列来说是第九个,也就是5,记为Q3
好了,现在Q1、Q2和Q3已经把你的数列分成了四个部分了,这三个数就叫做四分位数,也就是quartile.题目要求找出较小的,那就是Q1了,也就是2.
下面是interquartile range这个概念,其实简单来说就是Q3-Q1,对你的数列来说是5-2得3.
要注意的是对一个偶数个数的数列求中位数需要采取一定的措施,这个时候的中位数应该是中间两个数的平均数.具体的你可以从下面的参考资料中找到:)

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