the following table shows the probability distribution for a discrete random variable. X- 11,14,16,19,21,23,24,29 P(X)- 0.07,0.21,0.17,0.25,0.05,0.04,0.13,0.08. what is the mean of this discrete random variable? (that is, what is E(x), the expected value of X?) A) 18.59 B) 19.625 C) 19 D) 20