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Math Help - (binomial probabilities)

  1. #1
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    (binomial probabilities)

    In problems 1-4, do the following (A) Find the indicated binomial probability by using table A-1 in Appendix A. (B) IF np > or = to 5 and nq is > or = to 5, also find the indicated probability by using the normal distribution as an approximation to the binomial distribution, if np < 5 or nq < 5, then state that the normal approximation is not suitable.

    * tha A-1 chart is the binomial probability chart

    1 With n = 14 and p = 0.6, find P (fever than 9)

    SInce its less then 15, i can use this a-1 chart i have, but I"m not sure how to do it when it says FEWER or GREATER than 9




    2. A multiple choice test consist of 40 questions with possible answers of a , b , c, d, and e. Find the probability of getting at most 30% correct if all answers are random guesses.
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  2. #2
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    2. A multiple choice test consist of 40 questions with possible answers of a , b , c, d, and e. Find the probability of getting at most 30% correct if all answers are random guesses.
    \sum_{k=0}^{12}C(40,k) (\frac{1}{5})^{k}(\frac{4}{5})^{40-k}
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by galactus View Post
    \sum_{k=0}^{12}C(40,k) (\frac{1}{5})^{k}(\frac{4}{5})^{40-k}
    You can use elastic brackets when you wish to bracket larger expressions:

    \sum_{k=0}^{12}C(40,k) \left(\frac{1}{5}\right)^{k}\left(\frac{4}{5}\righ  t)^{40-k}

    These are \left( and \right)

    CB
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