I'm using it essentially to get some practice on some statistics problems. So here, number two. The grades on a statistics midterm for a high school are normally distributed with a mean of 81 and a standard deviation of 6.3. All right. Calculate the z-scores for each of the following exam grades, draw and label a sketch for each example. We could probably do it all on the same example, but the first thing we'd have to do is just remember what is a z-score? What is a z-score?