Variance is the average of the squared deviation from the mean value of observations. The square root of variation is called standard deviation. Variance can be computed as $\sigma^2 = \frac{\sum (X_i-\overline{X})^2}{N}$ or $\sigma=\sqrt{\frac{\sum (X_i-\overline{X})^2}{n-1}}$

Muhammad Imdad Ullah

Currently working as Assistant Professor of Statistics in Ghazi University, Dera Ghazi Khan. Completed my Ph.D. in Statistics from the Department of Statistics, Bahauddin Zakariya University, Multan, Pakistan. l like Applied Statistics, Mathematics, and Statistical Computing. Statistical and Mathematical software used is SAS, STATA, GRETL, EVIEWS, R, SPSS, VBA in MS-Excel. Like to use type-setting LaTeX for composing Articles, thesis, etc.

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