QUESTÃO

(Mackenzie-SP) No lançamento simultâneo de dois dados não viciados, a probabilidade de obter-se soma 7 é:
a) 1/3
b) 7/36
c) 1/6
d) 2/3
e) 1/12

RESPOSTA: C

Um comentário:

  1. Resolução:

    O espaço amostral deste experimento é:
    U = {(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6),
    (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6),
    (3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (3, 6),
    (4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6),
    (5, 1), (5, 2), (5, 3), (5, 4), (5, 5), (5, 6),
    (6, 1), (6, 2), (6, 3), (6, 4), (6, 5), (6, 6)}.
    Logo, n(U) = 36.
    Soma 7 → A = {(1, 6), (2, 5), (3, 4), (4, 3), (5, 2), (6, 1)} → n(A) = 6
    P(A) = 6/36 = 1/6

    ResponderExcluir