北航三版信息科学基础答案第3章 离散信源(2)

?p(s1)?p(s3)??3p(s)?p(s1)2??4

p(s)?4/11?1??p(s2)?3/11?p(s)?4/11?3(2)

H??????p(ei)p(ej/ei)logp(ej/ei)ijk3333411?43 ????log??log41144?114322311 ??log??log11331133411433? ??log??log?11441144? ?0.840 bit

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