Question

Find the expection of getting head when two coin are tossed

Answer 1

Expectation of getting heads on both :
(1/2 * 1/2) = 1/4.

Expectation of getting heads on either one or more :
(1/2 * 1/2 )+ (1/2 * 1/2) + (1/2 * 1/2) = 3/4.

Expectation of getting heads on only one of the coins :
(1/2 * 1/2) + (1/2 * 1/2) = 2/4

Answer 2

When 2 coins are tossed then possibilities are
HH, HT, TH, TT
p(both head) =1/4
P(at least one head) =3/4
P(at most one head) =3/4
P(only one head) =1/4