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Math Help - Teenage Pregnancy Probability

  1. #1
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    Teenage Pregnancy Probability

    Help will be more appreciated......
    A recent study on teenage pregnancy indicates that 5% of the female population will get pregnant sometime in their teenage years. Suppose 15 teenage women were randomly selected. Find the probability that 1 of these women will get pregnant during their teenage years.
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  2. #2
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    Hello Allenge
    Quote Originally Posted by Allenge View Post
    Help will be more appreciated......
    A recent study on teenage pregnancy indicates that 5% of the female population will get pregnant sometime in their teenage years. Suppose 15 teenage women were randomly selected. Find the probability that 1 of these women will get pregnant during their teenage years.
    This is an example of a Binomial Distribution. The probability of 'success' (that a given teenage woman chosen at random would get pregnant in their teenage years), is denoted by p. The probability of 'failure' (that she would not), is denoted by q = 1-p. If the experiment (choosing and interviewing a teenage woman at random) is repeated n times, then the probability of r successes and (n-r) failures is:

    \binom{n}{r}p^rq^{n-r}

    So you need to put p = 0.05, q= 0.95, n = 15, r = 1.

    (I think the answer is 0.366 (3 d.p.)

    Grandad
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  3. #3
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    Yeah that worked.....Thanks alot; you are saving a day here.....
    I'm still working really hard on getting a handle on this class, so please bear with me for couple of days.
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