Our mean experience, and I'm going to denote it with mu, because we're talking about the population now. This is a parameter for the population. It's going to be equal to the sum from our first data point, so data point one, all the way to data point, in this case, data point five. We have five data points. So we're going to take all from the first data point, the second data point, the third data point, all the way to the fifth. So this is going to be equal to x1 plus x, and I'm going to divide it all by the number of data points I have, plus x2, plus x3, plus x4, plus x sub 5, subscript 5, all of that over 5. And as we said, this is a very fancy way of saying, I'm going to sum up all of these things, I'm going to sum up all of these things, and then divide by the number of things we have.