Problem
a) You are playing the game of fliping a coin with the following outcomes: Head = you win $1, Tail - you lose 50 cents. What is a mathematical expecation of the result of this game?
b) You are roling a dice and you will get $100 if it gets "6" and you will have to pay $20 in case of any other result. What is a mathematical expectation of the result of this game?