So what you do is, if I wanted to know the probability of getting between negative 1 and 1, what I do is, let me get back to my pen tool, what I do is I figure out what is the probability of getting minus 1 or lower, right? So I figure out this whole area and then I figure out the probability of getting 1 or lower, which is this whole area, well let me do it in a different color, 1 or lower is everything there. And I subtract the yellow area from the magenta area and I'll just get what's ever left over here, right? So what I do is I take, and that's exactly what I did in the spreadsheet. Let me scroll down. This might be taxing my computer by taking the screen capture with it. So what I did is I evaluated the cumulative distribution function at 1, which would be right there.