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? Or even more specifically, it's like asking you, what's the area of a line? An area of a line, if you were to just draw a line, you'd say, well, area is height times base. Well, the height has some dimension, but the base, what's the width of a line?