Suppose you roll a pair of six-sided dice and add their totals. The probabillity model is given below.
Sum 2 3 4 5 6 7 8 9 10 11 12
probability 1/36 1/18 1/12 1/9 5/36 1/6 5/36 1/9 1/12 1/18 1/36
(a) What is the probability that the sum of the numbers on your dice is 11 or 12
