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18.8**What we already learned in class IX**

**What we will learn**

**Method to Calculate Mean by direct method**

**Method to calculate Mean by short-cut method**

**Method to calculate Mean by Step-Deviation method**

**Arithmetic mean of a continuous frequency distribution**

**Find the mean of the following distribution by direct method**

**Find the mean of the following distribution by Shortcut method**

**Find the mean of the following distribution by Step-Deviation Method**

**What is Median ? How do we calculate it ?**