I almost mentioned that, so it's funny you did. Lol. I noticed when I saw it in the theater that the formula for the variance was written wrong. If I recall cor

I almost mentioned that, so it's funny you did. Lol. I noticed when I saw it in the theater that the formula for the variance was written wrong. If I recall correctly, it was zero because it was subtracting the same term twice since either both squares were either inside or outside the brackets instead of the proper formula. I never went back to take a look at the rest of the board. Upon rewatches, my eyes always go back to that same spot.