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标题: Prep Math question [打印本页]

作者: ShirleyWong 时间: 2012-7-26 11:35 标题: Prep Math question

Three boxes of supplies have an average weight of 7kg and a median weight of 9kg. What is the maximum possible weight, in kg, of the lightest box?

a. 1
b. 2
c. 3
d. 4
e. 5

Related to this, if I have 1, 2, 2, what is the median? Thanks.

作者: wswhdlp 时间: 2012-7-28 09:55

is 2

作者: ShirleyWong 时间: 2012-8-1 06:23

the answer is 3. I'm confused too. so what is the median if we have a series of 1, 2, 2 for example?

作者: veralove3271 时间: 2012-8-2 06:37

Sum=7*3=21
the median is 9 meaning A 9 B
A+B=21-9=12

You want to minimize B to maxmize A; in other words, B is at least 9. If B is at least 9, A has to be 12-9=3.

作者: ShirleyWong 时间: 2012-8-2 20:03

so, 3, 9, 9 的median is 9?

作者: veralove3271 时间: 2012-8-3 21:02

Yes; you should read Statistic foundation first.

Any odd set of numbers, the median is always the middle one.
Any even set of numbers, the median is always the sum of the

middle two divided by 2.

作者: ShirleyWong 时间: 2012-8-4 08:18

多谢。这样这道题就明白了。

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