So, there are n n y's right over here. This was just a particular example, but I am going to try to stay general for the rest of the video, because now we are really trying to prove this result right over here. So, let's just take the expected value of both sides. So, what is it going to be? So, we get the expected value of x is equal to, well, it's the expected value of all of this thing, but by that property right over here, this is going to be the expected value of y plus the expected value of y, plus, and we're gonna do this n times, plus the expected value of y, and we're gonna have n of these. So, we have n. And so, you could rewrite this as being equal to, so this is our n right over here. This is n times the expected value of y.