Suppose you roll a number cube numbered 1 to 6 a total of 200 times. predict how many times you would expect to roll the number 3.

Probability of rolling a 3 is 1/6
200 x 1/6 = 200/6
Expectation = 200/6 ie 33.333, 33 to the nearest whole number

So you would expect to roll a three 33 times