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    LaurenHK's Avatar
    LaurenHK Posts: 2, Reputation: 1
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    #1

    Jan 3, 2012, 10:03 AM
    Number Cube 1
    What is the probability of rolling a 5 on a number cube 8 or fewer times in 20 rolls?

    0.911
    0.997
    0.526
    0.003
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #2

    Jan 3, 2012, 10:58 AM
    Use the Binomial distribution.

    Let X be the event of getting a 5. The probability of getting a 5 in one throw is 1/6.

    So, X ~ B(20, 1/6)

    Find P(X < 9)
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