Referring to the random variables whose joint probability distribution is given in Exercise 3.51 on page 106, nd the mean for the total number of jacks and kings when 3 cards are drawn without replacement from the 12 face cards of an ordinary deck of 52 playing cards.

Sample Distributions (Chapter 10) Important definitions explained in these notes: Sample space Event Parameter Statistical inference The Law of Large Numbers Discrete Probability Models Continuous Probability Models Random Variable Random Variable X bar or xx Central Limit Theorem An unbiased estimator The Rules of Calculating Probabilities: All values between 0 and 1 If S is sample space of a probability model, then P(s)=1 Addition rule for disjoint events: if two events have no outcomes in common, the probability that one or the other occurs is the sum of their individual probabilities a. P(A or B) = P(A) +