The vending machine in my gym is erratic. Sometimes it does not return anything after taking my money, but other times gives two for the price of one. I recorded the results and got the following probability distribution table: Number of items from the machine Probability 40% 20% 40% Calculate the expected number of items when you use the vending machine. a- 1.4 b. 1.2 C. 0.8 d. 1 e. 0.6