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zbc880318 · 发表于 2011-12-7 12:24:14

学生学习一下课程，用的是百分比，比较迷惑人
English, Math, Wxxxx
三门都学的 2%，学两门的 EM:9 WE:3 WM: 7
每门单独来看 E:32 M:29 W:16 (数字具体记不清楚了)
问三门都没有学的：100%- （32+29+16-9-3-7+2）%=100%-60%=40%

why subtract 9 3 7 and plus 2, why not 100%-E-M-W-EM-WE-WM-2%? thank you for help!

sdcar2010 · 发表于 2011-12-7 12:33:01

Venn diagram
EMW: 2
EM ONLY: 7; EW ONLY: 1; MW ONLY: 5
E ONLY: 22; W ONLY: 15; W ONLY 8

All of the above = 60

None of the above = 100-60 = 40

zbc880318 · 发表于 2011-12-7 12:45:16

EM, EW and MW mean just both each of them, not including EMW so why you said EM ONLY: 7; EW ONLY: 1; MW ONLY: 5
thx!

sdcar2010 · 发表于 2011-12-7 12:48:16

EM, EW and MW all include EMW.

zbc880318 · 发表于 2011-12-7 12:53:15

I see! thx a lot!

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