Three standard fair 6-sided dice are rolled. What is the expected number of 6's rolled? (For example, if two 6's and a 5 are rolled, then the answer is 2.)
If a dice is rolled, it is generally a 1/6 chance. If 3 are rolled, it is a 1/2 chance. So the chances of rolling a 6 is a 1/2 chance.