But there you have it. We know what the variance of y is. It is p times one minus p. And the variance of x is just n times the variance of y. So there we go. We deserve a little bit of a drum roll. The variance of x is equal to n times p times one minus p. So if we were to take the concrete example of the last video, where if I were to take 10 free throws, so each trial is a shot, is a free throw. So if I were to take 10 free throws and my probability of success is 0.3, I have a 30% free throw percentage, the variance that I would expect to see, so in that case, the variance, if x is the number of free throws I make after these 10 shots, my variance will be 10 times 0.3, 0.3 times one minus 0.3, so 0.7.