Let X be the random number of heads obtained in n= flips of a fair (p=1/2) coin. Then X∼Binomial(n=,p=1/2),. and the expected value of. Chapter 5 DISCRETE PROBABILITY. Example Flip a fair coin three times. The expected number of heads is. 0 ·. 1. 8. + 1 ·. 3. 8. + 2 ·. 3. 8. + 3 ·. 1. 8. So if we were to flip a coin, we expect heads to occur with a probability of.5, or the coin should land as heads half the time. We may not see it. It doesn't always.
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