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Solution :

To find the median , we prepare the following table : <br> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PS_MATH_X_C12_S01_017_S01.png" width="80%"> <br> Median = `L + (((n)/(2) - F))/(f) xx C` <br> Here , n = `35 implies (n)/(2) = (35)/(2) = 17.5` <br> This value appears in the class 20-30. <br> L = Lower boundary of median class = (20 - 30) = 20 <br> F = 13 , f = 5 and C = 10 (class length) <br> `therefore` Median = `20 + (((35)/(2) - 13))/(5) xx 10 = 20 + (9)/(2 xx 5) xx 10 = 29.`**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 ?**