What this tells you is, if you were to say, what percentage of people, or I guess, what is the probability, if you wanted to figure out what is the probability of finding someone who is roughly 5 inches taller than the average right here, what you would do is you would put in this number here, this 5, into x, and then you know the standard deviation, because you've taken a bunch of samples, you know the variance, which is the standard deviation squared, you know the mean, and you just put your x in there, and it'll tell you the height of the function. And then you have to give it a range. You can't just say, how many people are exactly 5 inches taller than average. You would actually say, how many people are between 5.1 inches and 4.9 inches taller than the average? You have to give it a little bit of range, because no one is exactly, or it's almost infinitely impossible to the atom to be exactly 5' 9". Even the definition of an inch isn't defined that particularly. So that's how you use this function.