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Binomial probability with TI-84 binomcdf function

  1. Feb 11, 2013 #1
    1. The problem statement, all variables and given/known data
    If a fair die is tossed 7 times what is the probability of at least two 4s?

    2. Relevant equations

    3. The attempt at a solution
    To solve this I used my TI-84's binomcdf function. I just want to see it I'm doing it correctly.
    p(2<=x<=7) = 1 - p(0<=x<=1) = 1 - binomcdf(7,1/6,1) = 0.330

  2. jcsd
  3. Feb 11, 2013 #2

    Ray Vickson

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    Science Advisor
    Homework Helper

    I don't have a TI-84, but if 'binomcdf' is what I think it is, your calculation is OK. Your answer is correct, too.
    Last edited: Feb 11, 2013
  4. Feb 11, 2013 #3
    Great. Thanks!
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