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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[@OninabResources]

You're most welcome. We appreciate your feedback, comment and prayer. We say Amen. Warmest regards.

[@billykimber7738]

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

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[@OninabResources]

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[@airamambiar4277]

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

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[@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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[@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

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Thanks it's well simplified

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This tutorial have greatly help me gain the concept to this statistic quiz... Thanks much sir for the help??

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[@andrupine6400]

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Wow! It's nice to know that. We wish you best of luck.

[@Alohavision27]

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

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You're welcome 😊 Glad it is helpful.

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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

[@kenrock6136]

thank you, you helped me

[@alieyam1207]

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

[@OninabResources]

Very correct! 👍

[@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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Very helpful... Thank you

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[@obengkeziah1869]

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.

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[@SukhdevSingh-my1zt]

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

[@OninabResources]

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

[@SukhdevSingh-my1zt]

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Thank you so much

[@munizasheikh8373]

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

[@OninabResources]

Yes.

[@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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Great content

[@onyediv982]

In getting the 3N/4 you said N is 100. How did we get the N? You said Is the total frequency of the distribution. If that is the N will not be 100. Please, help.

[@OninabResources]

Thanks for your feedback. I don't really understand your request for help because you asked a question and answered it. Could you please rephrase your question.

[@catherinechanda470]

Thank you so much 😊😊

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[@solomongeorge3315]

Which one is referred to as second quatlie q1 or q3??

[@OninabResources]

First quartile (lower quartile) is Q1 Second quartile (Median) is Q2 Third quartile (Upper quartile) is Q3.

[@solomongeorge3315]

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[@Shif1212]

Well explained