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Math Help - Binomial conditional probability.

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    Binomial conditional probability.

    A fair coin is tossed 5 times. What is the probability of obtaining exactly 2 heads if it is known that at least 1 head appeared?
    Last edited by mr fantastic; November 13th 2011 at 10:47 AM. Reason: Re-titled.
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    Re: binomial probability help please

    What is the probability of exactly one (1) "heads" in four tosses? Are you sure it's trickier than that? If so, why?
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    Re: binomial probability help please

    what do you mean?
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    Re: Binomial conditional probability.

    Quote Originally Posted by mtingt View Post
    A fair coin is tossed 5 times. What is the probability of obtaining exactly 2 heads if it is known that at least 1 head appeared?
    Let X be the random variable 'Number of heads'.

    Calculate Pr(X = 2 | X \geq 1) using the usual formula for conditional probability.
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