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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What is the probability of exactly one (1) "heads" in four tosses? Are you sure it's trickier than that? If so, why?
what do you mean?
Originally Posted by mtingt 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 using the usual formula for conditional probability.
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