And for those of you who have studied your calculus, that would essentially be the definite integral of this probability density function from this point to this point. So from, let me see, I've run out of space down here. So let's say if this graph, let me draw it in a different color, if this line was defined by, I don't know, I'll call it f of x. I could call it p of x or something. The probability of this happening would be equal to the integral, for those of you who have studied calculus, from 1.9 to 2.1 of f of x dx, assuming this is the x-axis. So it's a very important thing to realize. Because when a random variable can take on an infinite number of values, or it can take on any value between an interval, to get an exact value, to get exactly 1.999, the probability is actually 0. It's like asking you, what is the area under a curve on just this line?