Well, actually, you want a negative number, because you want your z-score to be positive or negative. Negative would mean to the left of the mean, and positive would mean to the right of the mean. So we say 65 minus 81. So that's literally how far away we are, but we want that in terms of standard deviations. So we divide that by the length, or the magnitude, of our standard deviation. So 65 minus 81. Let's see, 81 minus 65 is what?