If a fair number cubed is rolled 18 times, how many times is the number 2 expected to come up?

1 Answer

3

Explanation:

The odds of any given number being rolled on a fair 6-sided cube is #1/6#. And so the odds of rolling a 2 on any given roll is also #1/6#. If we roll the die 18 times, we can add up the #1/6# odds 18 times, which is the same as writing:

#18(1/6)=3#