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

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

[kelxey.]

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:))

[elly]

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!

[zebuluncooper]

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.

[mogumoguokayu]

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.

[AzainAtif]

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[leeharuchiyo]

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!

[ezramusonda]

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

[redcapshorts]

Saved my life. I needed this for maths homework

[insanitybast]

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

[tibatsondube]

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

[AzainAtif]

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[marijajohn]

Very informative and understanding keep it up

[noor-ojhe]

Thank you so much that was so helpful 😭💗💗

[israeltenny]

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

[mohanthrishan]

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

[AbdurRaheem__-ncyl]

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

[Nei]

When do you need to calculate the class width

[Aphile-gh]

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