TS EAMCET 7 May 2018 Shift 1 Solved Paper

In a game of throwing 3 coins, a player will loose Rs. 5/- for each head and gain Rs. 10/- for each tail. If a random variable X : S → R is defines as X (a) = net gain (a ∊ S) , then the mean of the random variable is (in rupees)