The PMF of the experiment that records the number of heads in four flips of a...

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The PMF of the experiment that records the number of heads in four flips of a...

The PMF of the experiment that records the number of heads in four flips of a coin, which can be obtained with the R commands attach (expand.grid (X1=0:1, X2=0:1, X3=0:1, X4=0:1)); table(X1+X2+X3+X4)/length(X1), is

x	0	1	2	3	4
p(x)	0.0625	0.25	0.375	0.25	0.0625

Thus, if the random variable X denotes the number of heads in four flips of a coin then the probability of, for example, two heads is P(X = 2) = p(2) = 0.375. What is P(X ≥ 2), that is, the probability that the number of heads will be at least 2?

math Statistics-And-Probability

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