Cumulative Frequency Diagram, Median, Lower & Upper Quartile, Interquartile Range, Percentile

Рет қаралды 43,099

3 жыл бұрын

We learn how to draw and use a cumulative frequency diagram to find the median, lower and upper quartiles, the interquartile range, 90th percentile and how to use the diagram to draw a box plot.
******** TIME STAMPS / CHAPTERS ********
00:00 Introduction
00:50 Cumulative Frequency Column
02:13 Plotting Points & Curve for Cumulative Frequency Diagram
04:33 Median Value
05:55 Lower & Upper Quartile
07:37 Interquartile Range
08:02 Median at n/2 or (n+1)/2 ?
09:03 Box Plot
10:22 90th Percentile (How to Find it)
11:54 Percentage Measuring Less than 32cm

Пікірлер: 64

@kelxey.5989 2 жыл бұрын

thank you so much for the useful info! You’ve taught me more than my math teacher did in 13 minutes instead of an hour:))

@RadfordMathematics 2 жыл бұрын

Thanks for your kind comment Kelxey, I really appreciate it 😊. Truly glad to read / hear this video helped!!! Take good care ✌️ John Radford.

@elly1976 Ай бұрын

I have watched more than 20 videos related to this topic. Your tutorial is so easy to understand and very clearly explained. Thank you so much!

@RadfordMathematics Ай бұрын

Thanks for such a kind comment!! I’m really glad this tutorial helped 😊

@ezramusonda6572 Жыл бұрын

I need more different lessons taught by Mr Radford also on how to plot a histogram

@zebuluncooper607 Жыл бұрын

my math test is coming up soon, made my doubts disappear in a millisecond just like that! you are truly amazing will definitely show this to the rest of my class who is struggling with cumulative frequency as well.

@RadfordMathematics Жыл бұрын

Hadn’t seen this comment 😊 Thank you so much for such kind words Zebulum! Truly glad you (and maybe your classmates) found it helpful 😊

@mogumoguokayu1418 9 ай бұрын

Thank you, good sir, you are the only channel on youtube that has any quality content. I'm sitting for my exam in 15 minutes and your videos are really coming in clutch no cap.

@RadfordMathematics 9 ай бұрын

Thanks for your kind comment!! I’m truly glad this videos (and others) helped 😊. Hope the exam(s) went well 🤞

@bryanalozie8917 18 күн бұрын

never stop posting videos

@RadfordMathematics 18 күн бұрын

Thanks for the kind comment! Really glad it helped 😊

@marijajohn4471 2 ай бұрын

Very informative and understanding keep it up

@RadfordMathematics 2 ай бұрын

Thanks for you kind comment! I’m really glad it helps 😊

@leeharuchiyo351 9 ай бұрын

my p4 is in 8 hours and this is the one topic ive never gotten the hang of, but you explained it really well! thanks sir!

@RadfordMathematics 9 ай бұрын

Thanks for your comment! I’m really glad it helped 😊

@redcapshorts9232 2 жыл бұрын

Saved my life. I needed this for maths homework

@insanityb3ast258 Жыл бұрын

good day , this vid was VERY helpful i have a test tomrrrow so this was great revision

@RadfordMathematics Жыл бұрын

Thanks for your comment! I’m really glad it helped 😊. All the best for tomorrow’s test!!!

@tibatsondube405 8 ай бұрын

gor an exam in less than 24hrs wow thank you soo much evrything is well explained

@RadfordMathematics 8 ай бұрын

Thanks for the comment! I’m really glad it helped 😊

@sifjdfijdnfepijfwifwjiwfij4208 Жыл бұрын

Thank you- this was super helpful!

@RadfordMathematics Жыл бұрын

Thanks for your comment, I really appreciate it! Truly glad it helped 😊. Take Good Care ✌️

@tarokicat Жыл бұрын

Thank u so much this helped alot

@highmanga535 Жыл бұрын

Thank you. Good lesson!!!

@RadfordMathematics Жыл бұрын

Thanks for your feedback, I really appreciate it !! Truly glad it helped 😊

@noor-oj9he 2 жыл бұрын

Thank you so much that was so helpful 😭💗💗

@RadfordMathematics 2 жыл бұрын

Truly glad it helped! Take good care 😊

@lordvolandemort4750 Жыл бұрын

thank you so much

@RadfordMathematics Жыл бұрын

Really glad it helped 😊

@blessinglowo2915 6 ай бұрын

thank you

@haze4612 2 жыл бұрын

thank you so much!

@RadfordMathematics 2 жыл бұрын

Thanks for your comment 😊 I’m truly glad it helped!! Take good care ✌️

@user-zu4go5tz6c 10 ай бұрын

this helped me very much thank u for this effort

@RadfordMathematics 10 ай бұрын

Thanks for your comment! I’m really glad it helped 😊

@mohamedhossam193 26 күн бұрын

Thank you sir

@user-zu4go5tz6c 10 ай бұрын

alhamdulilha I got good Marks because of your video may Allah succeed u and convert u to the right path of islam inshalla u will succeed ☺

@RadfordMathematics 10 ай бұрын

Thanks for your comment! I’m truly glad this video helped 😊 Take good care!

@natesanjyothikumari5256 Жыл бұрын

Very well explained sir,

@RadfordMathematics Жыл бұрын

Thanks Natesan! I’m really glad it helped 😊

@natesanjyothikumari5256 Жыл бұрын

@@RadfordMathematics i learned so much sir from this video, your explanation is clear and everyone can understand easily, please do more videos sir, you are very good teacher,

@natesanjyothikumari5256 Жыл бұрын

Lots of love from india sir

@vaibhavmn 10 ай бұрын

have math tom really saved me

@RadfordMathematics 10 ай бұрын

Really glad it helped 😊

@Crabby.1 Жыл бұрын

Just subbed

@RadfordMathematics Жыл бұрын

Thanks Bred 😊 Truly hope this video helped!! Take good care 🌱

@mohanthrishan9708 2 жыл бұрын

Thank you sir I have my math's exams tomorrow :)

@RadfordMathematics 2 жыл бұрын

Truly glad it helped 😊 Good luck tomorrow!!! 🤞

@guiguimvz Ай бұрын

valeu estamos juntos❤👍

@khalifaalfa4826 2 жыл бұрын

thanks allot

@RadfordMathematics 2 жыл бұрын

Thanks for your comment Khalifa! I’m truly glad this video helped 😊 Take good care ✌️

@israeltenny5042 10 ай бұрын

You just saved my education carrier..thank you Sir🙏🏾

@RadfordMathematics 10 ай бұрын

Really glad it helped 😊 Good luck for the rest of your course!

@danielagyei3931 Жыл бұрын

So is easy like that waow

@Nei88 Жыл бұрын

When do you need to calculate the class width

@AbdurRaheem_56_16-nc5yl 6 ай бұрын

Sir does it matter if we +1 in estimating median?

@RadfordMathematics 5 ай бұрын

No it doesn’t matter but usually, in exam questions, the total frequency is a multiple of 4 (like 80, 200, …) so it’s in our best interest to use n/2 instead of (n+1)/2. Furthermore, since when we work with a cumulative frequency diagram, we’re estimating: there’s no gain in accuracy when we use (n+1)/2 😊. Really hope that helps. All the best!

@user-uk6lz3sq9t 10 ай бұрын

Is it wrong when I be using n+1/2 instead of n/2

@RadfordMathematics 10 ай бұрын

No it’s technically not wrong. But when it comes to cumulative frequency diagrams we usually just take n/2 (you’ll usually end up with a more convenient number as well) Like 80/2 is 40 (easy to read off the graph) rather than (80+1)/2 = 40.5 (not convenient). Since we’re working with grouped data, where each row of the table corresponds to a class interval we’re not losing in accuracy… . The key thing to remember is that when we use a cumulative frequency diagram: we are estimating. So may as well use n/2 , which is far more convenient. Hope that makes sense 😊