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????????????????20???????????????? ?????????????????????????????????

???????????????????????????????????·??????????????????????????????????????ο???

????LZ??80?????????80+??????

??????????1250????80????????249??(?????????????3???)

??????????????????????????????????????????????????????????????

1.???????????????

??????????????????????????????????????-1??-5??????????????????+6??+10(???????????+5)????????????????????????????????? 5*??????????

?????????????????? ???????(????????????????????????????????)????3????????(?????????????)??

LZ??????????????????????????????????????????????????????????????????(???????????????????????????￡?-1??-5?????????????????????????????????????????????????-5?????????????????????????????-5??????????????????????裬?????????????С?)

??????????????????????????(2825+2525+2475)

???????1650+1500+1450 ????(1175+1025+1025=3225)

????????????????+??????????????3/5?????????5?Σ??????????3?????????????10????=3????Ч????????????????????=249*10/3=830????

?????830????????????Ч??????????????????249???????????+??????????????????249/3=83?Σ????+6??+7??+8??+9??+10??????+8

??????????????????????????????????????????????????????????(1/5)???????????????????Ч?????????????????????????????????1/5?????????????????????????+?????P(-????)=2/4=1/2??P(-??)=P(-??)=1/4?????????????????

??83??+?????????-???????=83*1/2=41.5?Σ?-??= -??=83*1/4=20.75??

83??+????? -???????=83*1/2=41.5?Σ? -?? = -?? =83*1/4=20.75??

83??+????? -???????=83*1/2=41.5?Σ? -?? = -?? =83*1/4=20.75??

????????????????? -????=41.5+41.5+41.5=124.5?? -??= -?? = -?? =20.75+20.75=41.5?? ????С?????????????????????

??α??????????-1,-2,-3,-4,-5??????-3.

??????????????????

????=2500-124.5*3=2126.5

??=1650-41.5*3+83*8=2189.5

??=1500-41.5*3+83*8==2039.5

??=1450-41.5*3+83*8=1989.5

????????????830

2.?????????????

??????????????????????????????????????????С?????min{2825-2189.5,

2525-2039.5, 2475-1989.5}=min{635.5,485.5,485.5}=485.5?486(?????????)

????????????????-??????????Ч??????

P(-????)=2/5 ??????-3?? ?????????+3?? ????? ?? ?? ?? ??????????????????486/3=162?Ρ???????Ч????????￡??????????????1/3??

?????????Ч???????=162/ (1/3)=486?Σ?????????486*5/2*2=2430(????)

?????????????????(????????????????????????????????????????????485.5)

???????

????=2126.5-486*3=668.5

??=2189.5+162*3=2675.5

??=2039.5+162*3=2525.5

??=1989.5+162*3=2475.5

????162????????????(??????С???485.5/3)?????·???????????0.5??????????????????

???????????????=????????830+??????2430=3260 (????????о?????????)

?????????????Σ???????????(????????????????????????0???????????????????????)

?????????2825-2675.5=149.5??150??????Ч???50??

P(-????)=2/5?????????￡?p(+??)=1/3????P(+??)=2/5 * 1/3 =2/15

??15??????2?μ??壬?????????=50*15/2*2=750

??????????????????????????=????????830+??????????2430+??????塿750=4010

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