How to find the expected value of the random variable X.
An experiment consists of flipping a fair coin three times and noting the number of heads and tails. A random variable x is definite to be two times the number of heads plus the number of tails.
Find E(x), the expected value of x.
(a) 3.5
(b) 4.0
(c) 4.5
(d) 5.0
(e) None of the others