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Questo 5. O nmero de acidentes no trecho X da Rodoviria Y no perodo da noite, em dias de chuva, uma varivel aleatria com a

Questo 5. O nmero de acidentes no trecho X da Rodoviria Y no perodo da noite, em

dias de chuva, uma varivel aleatria com a seguinte distribuio de probabilidade:

P(X=x) = k. (3-x). (4-x), x= 0, 1, 2, 3 (k constante)

a) encontre o v alor de k;

b) qual a probabilidade de nenhum acidente naquele trecho e naquele perodo?;

c) qual a probabilidade de pelo menos um acidente;

d) qual a probabilidade de uma acidente no mximo.

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