Suppose we have a bag with $10$ slips of paper in it. Eight slips have a $3$ on them and the other two have a $9$ on them. What is the expected value of the number shown when we draw a single slip of paper?
+321 You would expect 3 because you have an 80% chance of drawing a 3 but you have a 20% chance of drawing a 9
so you would get 3
