You're gonna add 12 more fives and then you're gonna divide by 12, and so it makes sense that your mean goes up by five. Let's think about how the mean changes if you multiply. So if you take your data and if I were to multiply it times five, what happens? So this equals this times five. So now, all the data points are five times more. Now what happens to my mean? Notice, my mean is now five times as much.