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?I???????????????? ?II????[90?100]??????????????????94????????????????????????95?96?97?98?99?100?6???????2??????????3????3??????????????????????????????????E?? 16. ???I????????????????
450.05+550.15+650.2+750.3+850.25+950.05 =72. ?3?? ???????75?
?5??
??????????????72???6?? ????????????????????????????????
2
?15? ?II??95? 96?97?98?99?100??2??????????????C6
?15??????????[90?100]?????0.0051080=4????
2
?6? ???????????????????????C4
??????????????????P?
62
?.?8?? 155
???????????0?1?2?3???? ?P(??k)?C3k()k()3?k,k?0,1,2,3 ??????????
2535
?5? ?12?
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发表于 2019-9-13 23:46:11