Joey plays a game where he purchases three gum balls from a gum ball machine that has 1,000 gum balls in it. If all three are green, he wins a prize. What is the probability that Joey will win this game if he could put the gum balls back in before he picked the next one?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?