Question

The expected value of the number of heads obtained when three fair coins are tossed simultaneously is

(A) 1

(B) 1.5

(C) 0

(D) -1

Answer 1

(B) 1.5

p=1/2

q=1/2    [∵q=1-(p)]

n=3

Expected value E(X) = np =`3xx1/2=1.5`