All right. So in number 13 are not 13. 19. Sorry. In 3.1, we're talking about pH and water in tap versus bottled water. So notice that the tap numbers are a little bit higher than the bottle numbers for the pH. So we're trying to determine the me meeting a mode of pH for each type of water in part A. So I already have the numbers listed in order from smallest to largest. That makes it easier to find the median later on. And so we have the mean is going to be adding up all of those numbers. So when you add up 7.1 all the way up to the 7.69 that should add up to 90 and there are 12 numbers in that list, so 90/12 is going to be 7.5. The median is going to be smacked up in the middle between those six between the six number. So 123456 So halfway between the 7.47 to 7.5, So you're gonna do 7.47 plus 7.5 over to that's going to give you a median of seven 0.485 Then mode is the number that shows up the most, and it turns out that 7.47 shows up three times, so the mode is 7.47 So now to continue in part A, we are going to look at the bottled numbers doing the same thing. We're going to get the mean median and mode. So when I add up all 12 numbers of the bottle data 5.2 all the way up to the 5.2 8/12, I add up all those numbers and you should get 62 0.33 And when you divide that by 12, you get 5.19 Now the median for this one is the one that shows up the most. 5.26 Oh, no. So that was the mode. So we'll go ahead and say mode real quick. I apologize. Mode is 5.26 It showed up the most, um, but then the median is halfway between the sixth and the seventh items. So when I go 123456 at the 5.23 and 5.24 Double check that. 123456 5.23 And the 5 to 4. I think I might have missed a number here. 5.25 point 95.13515 5.21 Well, there's 5.2 here. Okay, Apologize. There's a 5.2 here. So that means this 5.21 and 5.23 or the middle numbers. I apologize. Okay, so we add up here, we're going to add up the 5.21 plus 5.23 over to, and that's going to be 5.22 Mhm. All right. And then it says be supposed the pH of 7.1 in tap water was incorrectly recorded and it was recorded as 1.7. What will that do to the mean the median? And, um, what property will that median illustrate? And so, for part B. Um, because here's how you can do this without having to redo all the audition. You take 90. The total of the mean that you had before 90 minus 7.1, which is a difference of 7.1. And then you add the 1.7. So you take away 90 minus 7.1 because that was the bad one. And add 1.7, which is the error that will get you a new top number. So if you do 90 minus 7.1, add 1.7. You now have 84 point 6/12, which will get you seven point oh five. And so that's gonna be your new mean. The media is going to still be the same. Mhm. Yeah. So the median is unchanged and that term that they're trying to ask for is resistant. The median is resistant because it is unaffected by the extreme value.