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11-1 Measure of Center

Added Jan 07, 2018 •

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hi guys so sorry I'm not there today I hope that you guys had a wonderful break full of fun miss and love I am working on moving into my new house. I was telling you guys about before the break when you painted the walls and scrape the ceilings we got new floors and now I'm moving everything in and we got the keys a week later than we thought we would so I just needed an extra day to get all that stuff in but I will show you a picture tomorrow I hope you guys like your motivation on Monday I just wanted to remind you to erase the inner kid inside yourself every once in a while and have some fun even if it's with a little bit dorky or weird what that mean said say we are talking about measures of center and variation are your sense of question is how can you describe the variation of a data set need to continue popping on the essential question but I feel like I probably Ramble On long enough I believe what you guys have lots of definitions to go ahead and copy down but hopefully these words are all words cytosine before are the mean the median and the most and all three of those are measures of center so measure of center is a measure that represents the center or typical value of a data set the mean that's when you add up all the numbers and then divide by the number of numbers with their are or number of values of there are the median is the middle number so just whatever want smack dab in the middle and in the mood is the number or numbers that happen the most and the thing to know about the mole is that there may be one Mo nomos or multiple so you can have it feel too hot Salat Anthony Hopkins the same email but I'm hoping like I said that these are all words and their testing before until you guys going to stay confident like yes I know how to do this because I hope you do I'm assuming you guys definitely need to pause here to copy down those definitions so positive and I'm going to move alright so mean median and mode of the hourly wages so the first thing I like to do is rewrite all of these in numerical order so oh that looks terrible not better start at 8:15 goes first and next 8:25 and I crossed that's what I know what's the time and there's to 8:50 70 9 9:20 and 14th and that's all of them so the first thing they have to do for me is out of all the numbers they're going to give you 8:15 + 825 + 850 + 850 + 870 + 9 + 920 + 1450 are you divide all of that but how numbers that are in there are 1 2 3 4 5 6 7 8 number so you divide that by 8 and I did this problem earlier and I got the mean was 9.3 but go ahead and forget your calculator see if I'm right so this means that the average Bridge wait is $9 $0.35 which is pretty good although I think hourly wages are going up to $10 an hour but actually out of all the numbers and then divided by however many there are the median medium is the one in the middle stop I like to since I already have my numbers in order and this is really the reason why I put them in order as now I just crossed them off one and the other end one and the other end one and other end and then here I get left with two in the middle so if you got left with two in the middle all you do Adam together oh my gosh my Facebook page Parables so IQ 850 + 870 divided by 2 which is 8.6 also most of you guys are smart enough to look at that and say What's between 8.5 and 8.7 and .6 so that when you don't really need work for that and the last thing we have to find is the mode and the mode is what Athens the most I put most of the most man I really wanted to make my handwriting look better on here is the most and 850s only number that happens more than once though at 8:50 is a moat I'm Poppy says which measure of center best represents the data explain still this one all you're doing is in her own words explain to me is the mean the best measure is the meeting the bus number or is the mode the best number and why do you think why did you think that this one is totally up to you if you list of your own answer so go ahead and posit here and when you pause it here you guys can actually go ahead and do the next one cuz the next one is on your own practice so the next thing I will see you after this is the answers to the next page Fight Night so mean median mode of this data set the mean was 9.56 or 9.5 repeating the median is 11 I mean on those this time when you crossed out the numbers you only ended up with one number in the middle end up with one number in the middle of the night number is your answer so in this case are mediums just 11 and then the mode equals 12 cuz it hackers three times I am so up next outliers and I believe I gave you something ashes outliers a date of value that is much greater or much less than the other values in a data set for example in dollars is like a number that is not near any of the other numbers so my little star here there we go I thought you'd watch anyways looking back on example one was there any outliers I'm so example when was the first one week there were there any outliers then how to affect the data so if you think if we have an outlier that is a lot bigger how do you think that changes our answers how does it change our middle of our know we have an outlier that's a lot bigger sockets take a second to talk it over with the people next to you hopefully you guys are saying that it makes your middle finger so if you have an outlier that's bigger it makes your middle number your mean or you're mean bigger and then what about if you're a liar is a lot smaller what does that do to your mean to make sure meeting in your mean so just addressed and skews on the data just a little bit I'm so measures of variation is a measure that describes the spread or the distribution so it tells us about how far or close the numbers are to each other in a range is the first measure of variation so range it's just the difference or subtracting the greatest value and the smallest about you so for this example to find the range of the ages for each show show the range or Shoei is first man to take the smallest number believe it's 19 can we subtract that from the biggest number which looks like 31 however I feel like there's a small chance I did that wrong because I'm very tired right now I've been working everyday for like 12 hours a day painting and scraping and lifting and moving and so many things and I'm exhausted right now but it's okay so I believe that the range Rochelle a is 12 and then the range for Shelby I'm so smallest number I believe it's still 19 however the biggest number is definitely 48 so 48 - 19 is 29 MMS all they wanted us to do they might like ask a follow-up question like which still had the greatest range or I don't know I don't know but you guys are smart people and you could tell me that Shelby has a greater range because remember stick Alright and then I think we have one more example and then that's it I want to try and do this all in one video and see how long it takes to work a table that displays the frequency of various outcomes in a sample so I just wanted to do frequency table because it shows up on your homework tonight and last year I'm a bunch of kids did it wrong because they just didn't understand what frequency table meant so frequency table so this is saying that there was one person who had zero sibling there were four people who have one sibling there are 6 people who have two siblings or people who have 3 siblings so when I'm writing these numbers out to figure out what the mean median is modus I'm going to write 0 one time one four times 2 6 * cakes ever made shoes are going to strangle how can we go three four times 542 * and five ones so frequency tables telling you how many times each number occurs and so then now you guys can go ahead and do this on your own I'll show you guys the answers in just a second mean median mode and range there's just going to be the answer is I'm not going to show my work here you guys got this alright so believe these are the answers this one I can have the question mark by cuz I wasn't sure I got it right but check with people around you and I'm sure you guys fine but that was the easy stuff today tomorrow will do the slightly more lounging thing but I set it up so that it's nice and easy for you guys to do and I will hopefully see you tomorrow there is a small chance I take tomorrow off too so that I can finished cleaning and everything I need to do but I really hope to be there tomorrow alright bye guys

Uploaded by Lauren Stouffer.

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11-1 Measure of Center

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