Ben rolls two standard number cubes 36 time. predict how many time he will roll a sum of four.

You can make a 6 x 6 square to illustrate the probabilities

1 2 3 4 5 6

1 2 3 4 5 6 7

2 3 4 5 6 7 8

3 4 5 6 7 8 9

4 5 6 7 8 9 *

5 6 7 8 9 * &

6 7 8 9 * & $

* = 10, & = 11, $ = 12, I wanted maintain spacing

There are 3 4's. So it is 3/36 chance, which is 1/12 chance.