Question

Let y designate the number of tails which appear when 3 coins are tossed. Calculate E(y)

Answer 1

Here total outcomes are 8:-
hhh, ttt,hht, tth, hth, tht, htt, thh.
And, possible outcomes of coming a tail are 7:-
ttt, hht, tth, hth, tht, htt, thh.
E(y):- favourable outcomes/ total outcomes
:- 7/8