# Important Questions for Class 11 Chapter 15-Statistics

The Important Questions for CBSE class 10th Maths PDF includes complete sets of questions from Maths chapter-wise and topic-wise. Practice it and score good marks in your exam.

**Important questions based on NCERT syllabus for Class 11 Chapter 15-Statistics:**

*Question 1*: Find the eman and variance of 5, 7, 9, 27, 18, 22, 2, 8

*Solution*: Given 5, 7, 9, 27, 18, 22, 2, 8

Mean = $\bar{x}$ = $\frac{\sum j = 1 to 8x_i}{n}$ = 5 + 7 + 9 + 27+ 18 + 22 + 2 + 8/8 = 88/8 = 11

The following table is obtained

Variance = sigma^2 = 1/n summation j = 1 to 8(X_i – x bar)^2 = 1/8 * 572 = 71.5

*Question 2*: Find mean deviation about the mean for the following data :

*Solution*: Let us make a Table of the given data and append other columns after calculations.