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To find the expected value of random variable X.

An experiment consists of flipping the fair coin three times and noting the number of heads and tails. A random variable x is defined to be two times the number of heads plus the number of tails.

Find out E(x), the expected value of x.

(a) 3.5

(b) 4.0

(d) 5.0

(e) None of the others

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