EX
EX. A fair coin is tossed 3 times and let X be the random variable of number of heads in the 3 tosses. {X = 0} => {(TTT)} {X = 1} => {(TTH),(THT),(HTT)}. EX. P ( X = 0) = P {( TTT) } = 1 / 8 P ( X = 1) = P {( TTH),(THT),(HTT )} = 3 / 8 P ( X = 2) = P{ ( THH),(HHT),(HTH) ) = 3 / 8
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