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Math Help - Binomial distribution.

  1. #1
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    Binomial distribution.

    1. The probability that a randomly chosen sales prospect (a buyer) will buy insurance is 0.2. If an insurance salesman calls on six prospects, what is the probability that:

    i. He will make exactly for four sales.
    He will make more than four sales.

    where do i go from here

    help please




    f


    Last edited by mr fantastic; April 6th 2011 at 06:46 PM. Reason: Re-titled.
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  2. #2
    Behold, the power of SARDINES!
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    Quote Originally Posted by math321 View Post
    1. The probability that a randomly chosen sales prospect (a buyer) will buy insurance is 0.2. If an insurance salesman calls on six prospects, what is the probability that:

    i. He will make exactly for four sales.
    He will make more than four sales.

    where do i go from here

    help please




    f


    This is a binomial distribution with
    p=.2,n=6

    Binomial distribution - Wikipedia, the free encyclopedia

    for the first part you want k=4.

    For the 2nd part the sum of the probabilties of 5 sales and 6 sales
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    is there a particular formula to work with
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    Behold, the power of SARDINES!
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    Quote Originally Posted by math321 View Post
    is there a particular formula to work with
    Did you go to the link? It is right there? look for the probability mass function.
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  5. #5
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    i got

    6!
    -----
    4! (2!)
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  6. #6
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    Quote Originally Posted by math321 View Post
    i got

    6!
    -----
    4! (2!)
    Your answer is greater than 1. How can it possibly be correct?! You have clearly not used the formula correctly, part of it is missing. Go to your textbook or class notes and review examples.
    Last edited by mr fantastic; April 6th 2011 at 06:47 PM.
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