Tente usar esperan�a condicional.
Mais especificamente, condicione no n�mero de patos, digamos Y.
N�o tenho nem id�ia de como come�ar, s� entendi que o n�mero de ducks
num flock � Poisson(6). Algu�m arrisca?
"Ten hunters are waiting for ducks to fly by. When a flock of ducks
flies overhead, the hunters fire at the same time, but each chooses
his target at random, independently of the others. If each hunter
independently hits his target with probability 0.6, compute the
expected number of ducks that are hit. Assume that the number of ducks
in a flock is a Poisson random variable with mean 6." (A First Course
in Probability)
Agrade�o desde j�.
[]s, Claudio Freitas
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