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

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

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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.👇 kzbin.info/www/bejne/kITEiYhtot-IqdE

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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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this ia for non grouped data

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Nice to get that from you. We appreciate your feedback. Warm regards.

[@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

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It means Fc = 0.

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Pls what if the classes don't have the same width

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