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Math Help - Probability Distrubtion...

  1. #1
    Member looi76's Avatar
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    Probability Distrubtion...

    Question:
    In an experiment, a fair cubical dice was rolled repeatedly until a six resulted, and the number of rolls was recorded. The experiment was conducted 60 times.
    (a) Show that you would expect to get a six on the first roll ten times out of the 60 repetitions of the experiment.
    (b) Find the expected frequency for two rolls correct to one decimal place.

    Attempt:
    (a) n = 60, p = 1/6
    E(x) = n\times p
    E(x) = 60\times\frac{1}{6}
    E(x) = 10

    (b) Need Help...
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    Quote Originally Posted by looi76 View Post
    Question:
    In an experiment, a fair cubical dice was rolled repeatedly until a six resulted, and the number of rolls was recorded. The experiment was conducted 60 times.

    (b) Find the expected frequency for two rolls correct to one decimal place.
    The probability that you get a 6 on the second roll is 5/6 x 1/6 = 5/36
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