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**Introduction with some examples**

**Range**

**Mean deviation for ungrouped data or Individual data with some examples**

**Mean Deviation of a Descrete Frequency Distribution**

**Mean Deviation of a Grouped or Continuous Frequency Distribution**

**Limitations Of Mean Deviations**

**Variance of Individual Observations**

**Variance of a discrete frequency distribution**

**Variance of a grouped or continuous frequency distribution**

**Coefficient of Variation**