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Math Help - probability

  1. #1
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    Post probability

    find the probability of getting between 3 and 6 heads inclusive in 10 tosses of a fair coin by using

    a the binomial distribution

    b normal approximation to the binomial distribution

    thanks for any help

    btw i have 0.205 for part a
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by question View Post
    find the probability of getting between 3 and 6 heads inclusive in 10 tosses of a fair coin by using

    a the binomial distribution
    we already addressed this in another one of your posts recently. you want P(3) + P(4) + P(5) + P(6)

    b normal approximation to the binomial distribution
    how is your knowledge of the binomial distribution? i can tell you Bin(n,p) \approx Norm(np,npq) does that help? (n,p and q have the same definition as in part (a))
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  3. #3
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    Quote Originally Posted by Jhevon View Post
    we already addressed this in another one of your posts recently. you want P(3) + P(4) + P(5) + P(6)

    how is your knowledge of the binomial distribution? i can tell you Bin(n,p) \approx Norm(np,npq) does that help? (n,p and q have the same definition as in part (a))
    knowledge is very hazy, used to be extremely proficient in the probability area but havent been near it in a long time so finding it a bit tricky


    for part a i have 0.773 happy enough with that

    for part b i have the formula z = (r-Np)/(npq)^0.5

    should i just apply this, i have done so and expected the two answers to correlate somewhat but they arent
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