• Home
  • Textbooks
  • NCERT Class 11 - Math
  • Statistics

NCERT Class 11 - Math

Parvin Sinclair, G.P. Dikshit

Chapter 15

Statistics - all with Video Answers

Educators

Section 1

Introduction

02:29

Problem 1

Find the mean deviation about the mean for the data.
$$
4,7,8,9,10,12,13,17
$$

Uma Kumari
Uma Kumari
Numerade Educator
03:32

Problem 2

Find the mean deviation about the mean for the data.
$$
38,70,48,40,42,55,63,46,54,44
$$

Uma Kumari
Uma Kumari
Numerade Educator
03:41

Problem 3

Find the mean deviation about the median for the data.
$$
13,17,16,14,11,13,10,16,11,18,12,17
$$

Uma Kumari
Uma Kumari
Numerade Educator
03:52

Problem 4

Find the mean deviation about the median for the data.
$$
36,72,46,42,60,45,53,46,51,49
$$

Uma Kumari
Uma Kumari
Numerade Educator
03:42

Problem 5

Find the mean deviation about the mean for the data.
$$
\begin{array}{cccccc}
x_{i} & 5 & 10 & 15 & 20 & 25 \\
f_{i} & 7 & 4 & 6 & 3 & 5
\end{array}
$$

Uma Kumari
Uma Kumari
Numerade Educator
03:34

Problem 6

Find the mean deviation about the mean for the data.
$$
\begin{array}{l}
\begin{array}{llllll}
x_{i} & 10 & 30 & 50 & 70 & 90
\end{array}\\
\begin{array}{llllll}
f_{i} & 4 & 24 & 28 & 16 & 8
\end{array}
\end{array}
$$

Uma Kumari
Uma Kumari
Numerade Educator
03:29

Problem 7

Find the mean deviation about the median for the data.
$$
\begin{array}{ccccccc}
x_{i} & 5 & 7 & 9 & 10 & 12 & 15 \\
f_{i} & 8 & 6 & 2 & 2 & 2 & 6
\end{array}
$$

Uma Kumari
Uma Kumari
Numerade Educator
03:06

Problem 8

Find the mean deviation about the median for the data.
$$
\begin{array}{cccccc}
x_{i} & 15 & 21 & 27 & 30 & 35 \\
f_{i} & 3 & 5 & 6 & 7 & 8
\end{array}
$$

Uma Kumari
Uma Kumari
Numerade Educator
05:34

Problem 9

Find the mean deviation about the mean for the data.
$$
\begin{array}{|c|c|c|c|c|c|c|c|c|}
\hline \begin{array}{c}
\text { Income per } \\
\text { day in ? }
\end{array} & 0-100 & 100-200 & 200-300 & 300-400 & 400-500 & 500-600 & 600-700 & 700-800 \\
\hline \begin{array}{c}
\text { Number } \\
\text { of persons }
\end{array} & 4 & 8 & 9 & 10 & 7 & 5 & 4 & 3 \\
\hline
\end{array}
$$

Uma Kumari
Uma Kumari
Numerade Educator
04:53

Problem 10

Find the mean deviation about the mean for the data.
$$
\begin{array}{|c|c|c|c|c|c|c|}
\hline \begin{array}{c}
\text { Height } \\
\text { in cms }
\end{array} & 95-105 & 105-115 & 115-125 & 125-135 & 135-145 & 145-155 \\
\hline \begin{array}{c}
\text { Number of } \\
\text { boys }
\end{array} & 9 & 13 & 26 & 30 & 12 & 10 \\
\hline
\end{array}
$$

Uma Kumari
Uma Kumari
Numerade Educator
04:33

Problem 11

Find the mean deviation about median for the following data :
$$
\begin{array}{|c|c|c|c|c|c|c|}
\hline \text { Marks } & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 & 50-60 \\
\hline \begin{array}{c}
\text { Number of } \\
\text { Girls }
\end{array} & 6 & 8 & 14 & 16 & 4 & 2 \\
\hline
\end{array}
$$

Uma Kumari
Uma Kumari
Numerade Educator
05:01

Problem 12

Calculate the mean deviation about median age for the age distribution of 100 persons given below:
$$
\begin{array}{|c|c|c|c|c|c|c|c|c|}
\hline \begin{array}{c}
\text { Age } \\
\text { (in years) }
\end{array} & 16-20 & 21-25 & 26-30 & 31-35 & 36-40 & 41-45 & 46-50 & 51-55 \\
\hline \text { Number } & 5 & 6 & 12 & 14 & 26 & 12 & 16 & 9 \\
\hline
\end{array}
$$

Uma Kumari
Uma Kumari
Numerade Educator