????????￡???????????????????????????????????β???????????????????????1??9??15????????????????????????????
????????????????β????????????????????????β??????????????????50%???????????Ч??????????????
??????????????
1)?????????????50%??????12??
2)????????????????????50%*50%=25%??????18??
3)?????????????????????????????50%*50%*50%=12.5%??????24??
4)????????????50%*50%*50%=12.5%??????30??
?????γ?????????????????????????????????3??4??6???
????????200???
????1)200*50%=100???????12*100=1200????????0*100=0
????2)200*25%=50???????18*50=900????????3*50=150
????3)200*12.5%=25???????24*25=600????????(3+4)*25=175
????4)200*12.5%25???????30*25=750????????(3+4+6)*25=325
??????????200?????????1200+900+600+750=3450??
200??????????0+150+175+325=650
?????1??????=3450/650=5.3
1000?????佫???????5300??
?????н?????????????????????????????????ο?!???????????????????????????跳??????????????????????????治????????棬???????????????????????????????????跳????????????????????????????????е?????????!???鯔??????????????????????????????????????!
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????????????????????????????????????????40407???????40407????????
