16. A pair of dice is rolled. What is the probability of rolling a 7 or an 11?

We look at the probabilistic model for the experiment

x

p

2

1/36

3

2/36

4

3/36

5

4/36

6

5/36

7

6/36

8

5/36

9

4/36

10

3/36

11

2/36

12

1/36

We add up the probabilities for 7 and 11 and get

6/36 + 2/36 = 8/36 = 2/9