16、从集合(4,6,8,10,12,14,16,18,20,22)中选8个数组成新集合,问两个集合的MEDIAN是否相等
(1)两者的AVERAGE MEAN 相等
(2)新集合中不包含22
【机委】A
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选E
分析:
(1)例:去除4,14和去除8,10后剩下两集合median相同,mean不同
去除4,22和去除6,20后剩下两集合median相同,mean相同
所以(1)alone is insufficient
(2)例:去除4,22和去除20,22后剩下两集合mean不同
去除4,22和去除6,22后剩下两集合mean相同
所以(2)alone is insufficient
(1)(2)together是不可能的
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20. y=(x-1)(1-k/2)+(2-k)*x/2 What is the slope of line?
【确定】1-k ;;;(2)
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应该是2-k嘛
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67.Five boxes maximum capacity currently hold pieces
90 70
80 70
50 30
80 50
40 40
rearrange it so that the maximum capacity - holding pieces for all five are the same. So second box should be ?
【讨论】62
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(80-[(20+10+20+30)/5]=64
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67.Five boxes maximum capacity currently hold pieces
90 70
80 70
50 30
80 50
40 40
rearrange it so that the maximum capacity - holding pieces for all five are the same. So second box should be ?
【讨论】62
---------------------
(80-[(20+10+20+30)/5]=64
我赞同64。题目问若使每个盒子(最大数-实际数)相等,第二个盒子放几个?
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