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What do you mean by the terms Skewed Data, Outliers, Missing Values and Null Values 1 (i2tutorials)

What is the importance of Mean, Variance, Standard Deviation in identifying details of particular feature in Dataset? How do you calculate it?

Mean is average of a given set of data.

Mean (i2tutorials)

Variance is the sum of squares of differences between all numbers and means.

Variance (i2tutorials)

Standard Deviation is square root of variance. It is a measure of the extent to which data varies from the mean.

Standard deviation (i2tutorials)

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