֫hרעرǿһʼˢ⣬ȫĶĿϡ
Լûˣ̧ͷֻĻ
֫h߿⣬ĿƺܺãرӢƵĻ֪ʶʵżһ¡
ͱǰ⣬Сʣһʣһֱûʲôͷ
xֲpx=1=1-px=0
ȥģ⣬ѶϤС
֫hϲʲô츳ѡֻ֣ŬͶ͵ȡ
ԣҪڸ߿֮ʣı飬֪ῼЩ͡
һ⣬ס
֫hҧָĻﻭͿͿ㡣
ӣһֻǽָӳĻϵ˵㡣
ԵƵɤ֫hߡ
e(y)=a1+a2+a3an
=6/1(5/2)0+5/2)1(5/2)n-1+3/n
лôһѣ֫hඥ
3/n+18/5-9/1x(5/2)n-1
лĴ𰸣һЦڣ
֫h֪Ӧл˼άĺá
ˣӻܰôѵ
ҼǵûĻ
֫hʲô˵֮ӦҪаҪԣ
л°֫hϣȥ𣿡
֫hأ
ȫʡİ
֫h˵õ
ָ
̫ᣬȻմȾ
֫hһš֣Īȡ
ֱлߵЦŷӦڶ
֫h
ű̫ˣ֫hѧŶ١
лһۣöٺʣ
Ҿ롭˵һ룬֫hɢЦĪоԼǣűߡ