So we've defined two random variables here. The first random variable, X, is the weight of the cereal in a random box of our favorite cereal, Mattheys, a random closed box of our favorite cereal, Mattheys. And we know a few other things about it. We know what the expected value of X is. It is equal to 16 ounces. In fact, they tell it to us on a box. They say, you know, net weight, 16 ounces.