Statistics: Quartiles of Grouped Data

The video covers calculating Upper Quartile, Lower Quartile, Interquartile Range and Semi Interquartile Range. Please be informed that the middle (second) quartile is the same as median which has been covered in our previous video. Check the links below:
Mean, median and mode of grouped data arranged in descending order of class intervals. ( • Mean, median and mode ... )
Mean, median and mode of grouped data arranged in descending order of class intervals. ( • Mean, Median and Mode ... )
Mean deviation, variance and standard deviation of grouped data( • Mean deviation, varian... )

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Just so you know semi-inter quartile range is the same thing as quartile deviation 😊

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[@airamambiar4277]

What if my LCB in upper quartile for W is not uniform?

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[@Alohavision27]

why can't we choose LCB the lower value of class like 21?

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[@raj5958]

Does it matter for even and odd ,or to impliment it directly 🤔

[@theyoungguitarist719]

If it is odd then replace N/4 with (N+1)/4..just like median

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@@OninabResources No, I don't think I will

[@gbandeemmanuel6438]

Please I want to know whether the formula is fixed this way or there's another way formula because the quartile can be calculated using i.e say Q3=3/4(n+1). So can you substitute this one too in the formula.
Thank you

[@OninabResources]

No! This formula only allows you to know where the upper quartile lies which will henceforth allow you to get other parameters in the actual formula used in the video. Thank you ❤️

[@gbandeemmanuel6438]

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[@yuu_ze]

this ia for non grouped data

[@aminausman671]

Very helpful video thanks

[@luna-bj2cx]

When finding Fc which is the frequency before your quartile class, what if your quartile class is the first class? how would you find Fc

[@OninabResources]

It means Fc = 0.

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This was very helpful. Thank you

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[@Titusefeinge12]

Much respect sir, Yu supposed to go until standard deviation and coefficient of variation 😢😢

[@OninabResources]

Thank you for your feedback. Follow the link below for standard deviation of grouped data.👇
th-cam.com/video/ZSaXU7mzUso/w-d-xo.html

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Please,if it is arrange in descending order, how will you get the FQ. ??

[@OninabResources]

The process of finding FQ and TQ will be reversed.

[@SukhdevSingh-my1zt]

what would happen for LCB, if the first data range is starting from 0 ?

[@OninabResources]

It's (0 - 1)/2 = - 0.5

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[@sydneychizalila6835]

Very clear,, thankyou

[@alieyam1207]

what if my lower quartile at marks 21-30? should I use LCB 20.5 ? and fc = 0?

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[@monikasingh7134]

And if 1st marks class is started from 0 like 0-10 Or whatever and my lower quartile class is also this one then what we will take as the value of L........

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Thank you very much

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[@thomaswangu973]

Great Video, really clarified my understanding. But I only have one question...What happens if my lower quartile(Q1) is found (in the case of the video) to be in the first row(21-30).How will I calculate my Cummulative frequency before quartile class(Fc)? Since it is the first box and non comes before it...Please help, because i am lost.

[@OninabResources]

In that case, the cumulative frequency before the lower quartile will be zero.

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I was also stuck on this question🙂

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Can we find quartile 1, if it lies in ist row of table?

[@OninabResources]

Yes.

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Very and simple way ✊🏻❤️

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