Variance for grouped and ungrouped data ch 4 lec 6

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Semi interquartile range and quartile deviation. Variance for grouped and ungrouped data.
Range is a simplest measure of dispersion. Range is a difference between largest and smallest value. Range for grouped and ungrouped data are describe.
Measures of dispersion, skewness and kurtosis also introduce in this chapter. Most common measures of dispersion range, semi interquartile range, mean deviation and standard deviation also discuss in video. Measures of dispersion meaning how much values disperse from their averages.
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miss i have queri about x in SD for group data kindly ye bta dein x is mid point between two class limits or class boundries where wo took different of +0.5 in high value and -0.5 in lowest value kindly gauide

sial
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Mam kindly ya bta den k me na kuch Jaga pa standard deviation k formula me n-1 Dekhna ha. Kia wo sahi ha
Jaisay k group data k liay. Please answer mam

ishratnawaz
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Mam ungroup data MN h kasy find Karen gy

ainshahzadi