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Math Help - Probability Evaluation (Binomial)

  1. #1
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    Probability Evaluation (Binomial)

    These questions are driving me batty.
    Pr (X < 3) for X ~ Bi (10, .2)

    That's a less than or equals to sign, I wasn't sure how to do it.


    Also, if you have time, can you show me how to do

    Pr ( 3 < X < 7) for X ~ Bii (15, .6)

    Thanks
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  2. #2
    Super Member Random Variable's Avatar
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     \sum_{i=0}^{3} \binom{10}{i} (0.2)^i(0.8)^{n-i} = \binom{10}{0} (0.2)^{0}(0.8)^{10} + \binom{10}{1} (0.2)^{1}(0.8)^{9} +  \binom{10}{2} (0.2)^{2}(0.8)^{8} + \binom{10}{3} (0.2)^{3}(0.8)^{7}
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  3. #3
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    Oh you're amazing. I have to do this with the statistical tables (no calculators for some strange reason) and I didn't realise that I could break the probability down like that.

    Thanks
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