The number of pounds a player can win at the slot machines is modelled by a random variable X with the following probability mass function: a -1 0 NI- N p(a) OO Pmf Questions 1. What is P(X2 = 1)? This part question is worth 1 point. 2. What is the expected value of X2 ? This part question is worth 1 point. 3. What is the expected value of X4? This part question is worth 1 point. 4. What is the variance of X2 ? This part question is worth 1 point