How to find the 20th and 80th percentile of a data set

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👉 Learn how to find the percentile of a data set. The kth percentile of a data set is the data value that appeared in the kth position after the dataset has been divided into 100 equal parts. Thus to find the kth percentile of a dataset, we first divide the dataset into 100 equal parts, and then the data value in the kth place is the kth percentile of the dataset. If more than one data value falls in the kth place, their average is taken.
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Опубликовано:

21 окт 2024

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Комментарии : 122

@Bostonchamps295 3 года назад

I remember watching this guys videos when I was a freshman in high school, now im a senior in college and yet EVERY time I find myself going back to these videos because they are SO EASY to understand

@dianamora6266 4 года назад

Brian, just thank you. This is my fourth time taking statistics in college :) and it finally made sense

@brianmclogan 4 года назад

Nice, coming from me who hated statistics. Keep up the work

@MarisolHernandez-hk6wj 5 лет назад

You saved my life in math 1050 and one year later here you are saving my life in social statistics 😭

@alliepasch 4 года назад

Same!

@Salvation1984 2 года назад

You Sir, have a gift in teaching! Your kids are very lucky to have you, and thanks to technology, we are lucky to have you explain these concepts! Thank you!

@ericatwood856 4 года назад

That was so clear and understandable. I watched the lecture videos for my stats course and it made no sense at all. This was extremely helpful!

@languageandmana9255 8 месяцев назад

Wow! You gave the simplest and quickest way of calculating it. Thank youuuuu

@Ravey988 4 года назад

Thank you soooo much ‼️ this explanation was the clearest one I found so far and it helps so much given most classes or online during this pandemic. I now feel like i can do this 🙏🏾

@huntervolcan9218 5 лет назад

This is so much easier to understand than what I am reading in my text book.

@zackhamzy608 4 года назад

This is such a more simple way than I was taught!!! Thank you so much

@karenlee6649 4 года назад

You are an amazing teacher! You made this so simple to understand. Thank You!

@roseleizlmanlapaz2563 Год назад

thank you so much sir for the comprehensible explanation!what if the result is not a whole number?like getting a 5.8 or a 15.95?will i round it off to the nearest tens?thank you so much!

@GISSELLEhd 3 года назад

I am not really fond of numbers and I am a Project Manager, this has saved my day. Thanks

@amoghili 4 года назад

I'm over here trying to listen to my math teacher when I can just go onto youtube and just watch this video. This reeeeely helps.

@asooo6806 3 месяца назад

Thank you so much🙌 This was so easy to understand.

@123Closure 4 года назад

thank you for this! I've been stumped for the past 30 minutes

@fihliwemkhwana2523 2 года назад

Thank you for teaching me I needed it

@ank3t591 4 года назад

Thank goodness you were here to help!😥Love from Mauritius ❤

@hardeepcharak 6 лет назад

What about P/100* (n+1). It should be 0.2*(10+1)=2.2. Now get two numbers that are below and above 2.2th place, those are second 170 and third 174. Get their average (170+174)/2= 172. All the values below 172 are 20% of all data. Same method for 80th Percentile as well.

@brianmclogan 6 лет назад

thank you for sharing

@FB-tr2kf 5 лет назад

Wrong. 20th percentile should be 0.2 x (174 - 170) + 170 > = 170.8

@preciousvernellebonto9271 4 года назад

@@FB-tr2kf it's also the same.In your case I see that you used interpolation method but if you happened to use Mendel and Sincich's Method just like what Hardeep used then it will also arrive at the same position--2nd which is 170. Interpolation method is just more accurate than Mendel's. I just didn't get why it happens to be 174 tho.

@elainejones7877 2 года назад

Wow! You made this sound so easy. Now it makes so much sense. You are a great explainer. Thank you so much!

@alexandrakovar1226 15 дней назад

Hi, what is the number you got is a decimal? How do I count 15.8 of my numbers to get the 90th%? Thank you!!

@lisasvideos944 7 лет назад

You are amazing teacher, I have my exam tomorrow

@brianmclogan 7 лет назад

Just happy to help, best of luck

@solakenny1604 7 лет назад

Sir,what if you have a large population i.e 190,200,210,220,230.......480. How are you gonna get the percentile?

@wesselbotha3928 4 года назад

@@solakenny1604 R programming

@porschsbongz 2 года назад

Thank you, now my headache is over...

@amind1317 Год назад

Clear and simple to understand.

@brianmclogan Год назад

💪

@michelletomm9729 3 года назад

so happy to see you doing stats too. You demystified Pre calc last semester!

@m.onthatilemotaung3720 3 месяца назад

His wrong 80th is 186+188/2 = 187 20th is 170+174/2= 172 Because we got 2.2 on the 20th percentile you supposed round up and down leading you to the the 2nd and 3rd number, same with 80th❤

@shehab976 4 года назад

sir u explain so simply....wow

@valentinagrbic7845 8 лет назад

Omg! This is so great and clear! Thank you so much! You're an excellent teacher! :)

@brianmclogan 8 лет назад

+Valentina Grbic thank you, happy to help

@AnthonyGarcia-os2qw 3 года назад

Thank you I just started taking AP Statistics

@joshuagarnasa9267 3 года назад

Thank you so much 💖,this explanation can give me a example on how can I solve the percentile

@leonorabiga5051 4 года назад

Thank you for the clear and easy understanding!

@johnsbiketi8312 7 месяцев назад

Wow that’s great work.nice well understood

@rebeccarogers8141 2 года назад

Brian, thank you so much for this video! Beyond helpful!

@ItsMeltas 3 года назад

Oh my God! This simple calculation was giving me a headache, thank you sir

@mathhelpmadeeasy 4 года назад

This is a very interesting video on calculating percentiles. Finding percentiles is now easy. Thank you for sharing!

@lawrencemaloya3992 6 месяцев назад

❤great video sir , please do an exmple on how to calculate the same percentiles , using grouped data

@HirokoXD 4 года назад

Thank you so very much! This helps a lot more than you realize

@FrancisSantala 11 месяцев назад

I LIKE THE GOOD WORK U ARE DOING BUT CALCULATIONS ARE WRONG TRUST ME OR ASK ME WHY

@theghost8011 Год назад

Dear Sir, THIS IS WOW!!! I Found myself giggling. wow.

@mrxakashii7133 2 года назад

Thank u So Much❤🙏

@Alinho1907 3 года назад

hey so what about if it is in a descinding order do we still use the values above or greater than value x

@brianmclogan 3 года назад

must be in ascending order

@MrDogukan258 11 месяцев назад

that was good brian 👍🏻

@sunnylk6991 5 лет назад

percentile: (n+1)*p/100 your answer is wrong!

@TheBullOfLewisham 10 месяцев назад

Monday 11th December 2023. 23.32pm. "Dear Sir/Madam. Good-evening. How are you? I trust you are well." My Brother, is studying percentiles and he told me "it Is very complex but is good". Once he gets his Degree he is going on to do his Masters." 🙂 Yours Faithfully. Mr Francesca Kray.

@jasminea4147 3 года назад

You about to save my life in statistics😭

@soliatadeboye8057 4 года назад

But what if you get a decimal do you round it or what do you have to do?

@Golden_Tortoise 4 года назад

Are these statements all correct? a) < 174 = is the first 20 % of data b)

@supvilla5540 5 лет назад

aren't you suppose to add 1 to the n?

@primordialcat6986 4 года назад

only if its grouped data

@ibrahimahmad5161 7 лет назад

thanks U have said it all in just few minutes

@brianmclogan 7 лет назад

that is what I like to do!

@JoeyVincent15 2 года назад

Thank you!

@trxnqualyzed8719 4 года назад

What if it's a decimal!? 😩😩

@dangokissu 4 года назад

THANK YOU. omfg my professor keeps telling me I'm not following instructions correctly but she literally has NO INSTRUCTIONS like this. AND she disabled us from emailing other students so we can help each other out. She is EVIL.

@Treant. 4 года назад

Thank you very much sir

@janeorji323 Год назад

Hello You used *20* when solving for the 20th percentile. So why did you use just *8* for the 80th percentile instead of *80*

@TheeFitBabe 2 года назад

Question is why did you divide the 20 with 10 then the 8 was multiplied by 10?

@cedbentuzal9630 3 года назад

How about if value is not integers

@matthewclarkfrancisco4653 6 месяцев назад

What if it is decimal? .30(5)= 1.5

@MsVamPireChic 6 лет назад

I'm confused.....wouldn't it be 170 because 170 is the second number?

@brianmclogan 6 лет назад

no, those two values are the 20% so 174 is the 20th percentile as 20% of the numbers lie below 174, make sense?

@brigittehalun2437 4 года назад

what is the proper notation/symbol for percentile? i.e p37, 37 %tile...

@zoeylai680 6 лет назад

I had a math test today and i got a question wrong on finding the 30th percentile. The formula we used was b over 7 •100=30. So 7•30=210/100=2.1 and i rounded it to 2 and the second value was 18. But the answer was 20 (the third value in the data set). Is it because u round 2.1 to 3 and not 2.Some videos say that say the 30th percentile was 3 you would look to the third value in the data set and that would be the percentile. But then your video shows that if the 2nd percentile is 2 then you would go to the third value? Is it because you include the value AND the values below it or no? Idk if you will understand because it’s long

@brianmclogan 6 лет назад

It is all values that fall under that number so that is why 2.1 is rounded up to 3

@hdjamph1423 6 лет назад

@omegaman4153 3 года назад

thank you, excellent.

@marissa21211 Месяц назад

this video legit helped me understand this! no offense to my professor but he sucks at explaining this! :*(

@KomalSHARMA-dg8xg Год назад

You are fabulous

@justthegirl9799 6 лет назад

What if the values are in decimal?

@brianmclogan 6 лет назад

same process

@xitlaniedouglas8997 4 года назад

Brian McLogan or, are listed as CB’s?

@aharon1108 3 года назад

what if you have more than 10 numbers and the numbers are much more complex to deal with ???? this is just an easy trick with 10 numbers I need a broader formula

@CODINC 5 лет назад

Isn't it supposed to be 172 for 20 percentile?

@katymoran12 Год назад

What if I only have 8 numbers instead of 10th ?

@narendrameena4862 3 года назад

What is means for 80 percentile????

@note2self628 3 года назад

This is incorrect. The index is a whole number which means the answer would be an average of the 2nd and 3rd number.

@niffniffhooray 6 лет назад

If you have a whole number after finding the "locator" L, you're supposed to do (x sub L + x sub L+1)/2. This video was an oversimplification that some professors/teachers allow while others want the computation. And just to note, if you don't have a whole number for L, just round UP (not the same as rounding off).

@brianmclogan 6 лет назад

cheers, thanks for sharing

@majestic7768 3 года назад

Becomes tricky when 'n' (data points) is an odd number.

@abhishekbal399 3 года назад

It is not totally correct … but workable. There is a difference between 20 percentile and 20th percentile.

@brianmclogan 3 года назад

Noted well, thank you!

@Unncaptured Год назад

its wrong youll have to avg the 2 numbers ie. 20th percentile would be 170+174/2 = 172

@issackjirma581 Год назад

Determine the 90th - 10th percentile for the data given below: Time to travel to college Frequency Cumulative frequency 1 -10 8 8 11 -20 14 22 21 - 30 12 34 31 - 40 9 43 41 - 50 7 50

@johnsbiketi8312 7 месяцев назад

Bring full

@schnaicajeancharles6096 5 лет назад

I’m confused on how you got 174 as the answer.

@mahendrabhaioza2085 5 лет назад

That means that 20th percentile value r below 174 whicu is 2/10 numbers

@falcongaming1075 10 месяцев назад

Sorry but when i saw the thumbnail i literally saw johny sins😅😅

@ishan7975 4 года назад

@Brian McLogan What if it's a decimal!

@elhamamouchihamza980 4 года назад

you gotta round up to the next number

@jjdd3980 6 лет назад

What is the 33rd percentile for the intelligence quotient scores when the mean=100 and standard deviation=16?

@brianmclogan 6 лет назад

sorry just able to focus on what I am currently teaching

@Ramansingh-ty1zv 5 лет назад

Then u saying if u wanna get 100 percentile it would be infinity ??? What would be 100pecentile ?

@lisalisaj.9288 4 года назад

percentiles are only 1-99, there is no 100th

@zoetomkins1653 3 года назад

Epic video

@janechinamo9323 4 года назад

i just beg for a help in my qn which is requred to find the 20th percentile of the data set 6,7,9,10,11,12,14,14,15

@bronxboy101 3 года назад

9 would be the answer I think

@janechinamo9323 4 года назад

i dont get the concept clearly

@adityabramana8280 4 года назад

u suppose to add n+1

@Foxy994Anime 6 лет назад

i have 0.45/24 = 10.8 should i round off this to 11 or not? sorry im suck on math =(

@brianmclogan 6 лет назад

depends on your data set

@qojoindia 5 лет назад

Yes round it to the nearest intiger 11

@qojoindia 5 лет назад

Hope you are using > (n+1) p/100

@janaeallen7618 4 года назад

Meanwhile i got a decimal

@jjdd3980 6 лет назад

Can you please solve this problem????

@brianmclogan 6 лет назад

sorry just able to solve what I am currently teaching

@ashlyespela187 3 года назад

nice

@corryamon4668 5 лет назад

What of the 100th percentile

@bec.des3 5 лет назад

All of the scores are in the 100th percentile. It's basically 100% of the scores. 100th percentile will always be easiest to find for that reason, just look at the top number.