Statistics

An unbiased die is thrown seven times. Find the probability of throwing it at least five six's.

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asked by Heidi
  1. Use binomial distribution.
    P(r)=nCr*(p^r)(q^(n-r))

    n=7
    p=1/6
    q=1-1/6=5/6

    we need to calculate
    P(5)+P(6)+P(7)
    P(5)=7C5*(1/6)^5*(5/6)^2
    =0.001875
    P(6)=1.25*10^-4
    P(7)=3.57*10^-6

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  2. 0.005

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