1,1,.89,.71,.5,.29,.11, 0 and 0.

来源: 于 2010-10-13 15:58:22 [旧帖] [给我悄悄话] 本文已被阅读：次

for Expl: 3 bad 5 good : P(E)=( C(5,3)*C(3,0)+C(5,2)*C(3,1))/C(8,3)=40/56=.71....