Four coins are tossed at once. Let Y be the random variable representing the number of
heads that occur.
Let = 1, if head occur for coin i else 0, then is distributed according to Bernoulli distribution with parameter p = 0.5 (because coins are symmetrical)
Then is distributed according to Binomial distribution with parameters p = 0.5 and n = 4.
Then possible values of Y: {0, 1, 2, 3, 4}
Probability distribution of Binomial distribution:
Pr(Y=0) = 0.0625
Pr(Y=1) = 0.25
Pr(Y=2) = 0.375
Pr(Y=3) = 0.25
Pr(Y=4) = 0.0625
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