So this just tells you the point minus 20 is 25 less than the mean, right? That's all I did there. Then I divided that by the standard deviation, and this is the z-score, the standard z-score. So this tells me how many standard deviations is minus 20 away from the mean. It's 12 and 1 half standard deviations below the mean. And then I used that, and I just plugged it into essentially this formula to figure out the height of the function. So let's say at minus 20, the height is very low.