In Exercises 15 and 16, find the expected value of the random variable. 15. A person has shares of eight different stocks. The random variable x represents the number of stocks showing a loss on a selected day. X O 2 4 5 6 8 P(x) 0.02 0.11 0.18 0.32 0.15 0.09 0.05 0.05 0.03 16. A local pub has a chicken wing special on Tuesdays. The pub owners purchase wings in cases of 300. The random variable x represents the number of cases used during the special. X 2 4 P(x) - NI- WI - 18