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Math Help - binomial probability.

  1. #1
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    binomial probability.

    Scenario: "during any semester at the local college, 42% of the students are taking a math course. Determine the probability that if 10 students are selected...:"

    Question 1: That exactly 7 are taking a math course.

    Question 2: Less than 3 students are taking a math course

    Question 3: At least 3 students are taking a math course.
    Last edited by mr fantastic; November 19th 2011 at 08:04 PM. Reason: Title.
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  2. #2
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    Re: binomial probability... bleh

    Quote Originally Posted by foliocb View Post
    Scenario: "during any semester at the local college, 42% of the students are taking a math course. Determine the probability that if 10 students are selected...:"

    Question 1: That exactly 7 are taking a math course.

    Question 2: Less than 3 students are taking a math course

    Question 3: At least 3 students are taking a math course.
    Binomial probability is \binom{N}{k}(p)^k(1-p)^{N-k}.

    1) N=10~,~k=7,~\&~p=0.42.

    2) Let k=0,~1,~2 add up.

    3) subtract answer in 2) from 1.
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  3. #3
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    Re: binomial probability... bleh

    Ok, i got:

    1) ~5.4%

    2) My final answer was ~13.72% when I totaled the three up, first one I got ~10.17%, second got ~3.12% and third got ~.43%

    3) came out to 100-13.72 so 86.28%

    hope I got it right :s
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