Ͷf(xi)CovR1,R2=0.09×0.09×12=0.0081×12
ͶϵķVp=50%2×9%2+50%2×9%2+2×50%×50%×CovR1,R2
=0.00405+0.5CovR1,R2
Ͷϵ\(zhn)
ϵ0.4ϵf(xi)=0.4×9%×9%=0.00324ϵķ=50%×9%2+50%×9%2+2×50%×9%×50%×9%×0.4=0.00567ϵ\(zhn)?BR>⣺GͶABͶĿйn
Ŀ |
A |
B |
10% |
18% | |
(zhn) |
12% |
20% |
Ͷr |
0.8 |
0.2 |
ABϵ |
0.2 |
Ҫ
1ͶAB
S=(qun)ƽ=10%×0.8+18%×0.2=11.6%
2ABf(xi)
Sf(xi)=12%×20%×0.2=0.48%
3ABٷλλ?BR>S=
= =1.2352%
4ABϱ(zhn)ٷλλ?BR>S
P
1Ͷʲ֮ϵΣֻҪͶr䣬ʲʲ䣬ϵʾͲ?BR>2ϵ+1rʲ\仯ȫͬһͬܵκͶʷգr\(zhn)
ϵ-1rպ~ʵ׃ȫ෴˼ȫȫͶʷգr\(zhn)С
ϵ0+1rʹP}عϵ֮س͔̌ͣwͶʷՔ?BR>ϵ0- 1rʹP}Ǹعϵ֮ĸسֵ̌ͣԽС͔wͶʷՔԽ?BR>ϵrʲ֮صġͶ{ɷɢͶʷKЧrЧҪȸrЧҪС
ϱ(zhn)ļ㹫?
4.ͶKķ༰?BR>Ͷϵܷɷϵy(tng)պϵy(tng)
ϵy(tng)գɷɢգָijһضԭijһضʲӰĿԡͨɢͶʣϵy(tng)ԷܹͣɢЧĻַվܱȫϵy(tng)Kľq^Ϊպ͂}?BR>ֵעԖݚɢУ(yng)ͶRԺͶĿãͶͶĿijڣݚɢЧ(yng)Ƚԣһ̶ȺݚɢЧ(yng)[
ϵy(tng)գɷɢգָC仯гʲʵ׃ԣЩӰCķģֳCϵy(tng)Ӱʲķգܱɢ
ڡrʲģ
Ҫ|
һϵ
rʲģ
һϵ
һʲĦϵ˽?BR>1.
ʲĦϵָԷӳʲCȫʲƽ֮ϵһָ꣬ʲϵy(tng)CƽKӰ̶xҲϵy(tng)ָ
2.
ʽ1
ʽ2
3.
=1rʾõʲCƽʳͬ\仯Б͔ķһ£?fõʲķմCͶϵķգn1fõʲķճ̶СCͶϵķ
ͶϵĦϵգ
1.
ͶϵĦϵеʲϵļ(qun)ƽ(qun)ʲͶռ\ء
2.?
P192[5-3]ͶϵĦϵļ?-һ
ijͶABCʲɣйػĸʲĦϵֱ0.51.01.2RʲͶе\طֱ10%30%60%
ҪͶϵĦϵ
⣺⣬ У
3.ӰأͶϵĦϵܵʲĦϵʲͶռصӰ?/FONT>
1ͶAB
S=(qun)ƽ=10%×0.8+18%×0.2=11.6%
2ABf(xi)
Sf(xi)=12%×20%×0.2=0.48%
3ABٷλλ?BR>S=
= =1.2352%
4ABϱ(zhn)ٷλλ?BR>S
P
1Ͷʲ֮ϵΣֻҪͶr䣬ʲʲ䣬ϵʾͲ?BR>2ϵ+1rʲ\仯ȫͬһͬܵκͶʷգr\(zhn)
ϵ-1rպ~ʵ׃ȫ෴˼ȫȫͶʷգr\(zhn)С
ϵ0+1rʹP}عϵ֮س͔̌ͣwͶʷՔ?BR>ϵ0- 1rʹP}Ǹعϵ֮ĸسֵ̌ͣԽС͔wͶʷՔԽ?BR>ϵrʲ֮صġͶ{ɷɢͶʷKЧrЧҪȸrЧҪС
ϱ(zhn)ļ㹫?
4.ͶKķ༰?BR>Ͷϵܷɷϵy(tng)պϵy(tng)
ϵy(tng)գɷɢգָijһضԭijһضʲӰĿԡͨɢͶʣϵy(tng)ԷܹͣɢЧĻַվܱȫϵy(tng)Kľq^Ϊպ͂}?BR>ֵעԖݚɢУ(yng)ͶRԺͶĿãͶͶĿijڣݚɢЧ(yng)Ƚԣһ̶ȺݚɢЧ(yng)[
ϵy(tng)գɷɢգָC仯гʲʵ׃ԣЩӰCķģֳCϵy(tng)Ӱʲķգܱɢ
ڡrʲģ
Ҫ|
һϵ
rʲģ
һϵ
һʲĦϵ˽?BR>1.
ʲĦϵָԷӳʲCȫʲƽ֮ϵһָ꣬ʲϵy(tng)CƽKӰ̶xҲϵy(tng)ָ
2.
ʽ1
ʽ2
3.
=1rʾõʲCƽʳͬ\仯Б͔ķһ£?fõʲķմCͶϵķգn1fõʲķճ̶СCͶϵķ
ͶϵĦϵգ
1.
ͶϵĦϵеʲϵļ(qun)ƽ(qun)ʲͶռ\ء
2.?
P192[5-3]ͶϵĦϵļ?-һ
ijͶABCʲɣйػĸʲĦϵֱ0.51.01.2RʲͶе\طֱ10%30%60%
ҪͶϵĦϵ
⣺⣬ У
3.ӰأͶϵĦϵܵʲĦϵʲͶռصӰ?/FONT>