1. Home
  2. /
  3. CBSE
  4. /
  5. Class 11
  6. /
  7. NCERT Solutions class-11 Maths...

NCERT Solutions class-11 Maths Exercise 15.1

myCBSEguide App

myCBSEguide App

Download the app to get CBSE Sample Papers 2023-24, NCERT Solutions (Revised), Most Important Questions, Previous Year Question Bank, Mock Tests, and Detailed Notes.

Install Now

Exercise 15.1

Find the mean deviation about the mean for the data in Exercises 1 and 2.

1. 4, 7, 8, 9, 10, 12, 13, 17

Ans. Mean of the given data

Mean deviation about mean = = = 3


2. 38, 70, 48, 40, 42, 55, 63, 46, 54, 44

Ans. Mean of the given data

Mean deviation about mean =

= = 8.4


Find the mean deviation about the median for the data in Exercises 3 and 4.

3. 13, 17, 16, 14, 11, 13, 10, 16, 11, 18, 12, 17

Ans. Arranging the data in ascending order, 10, 11, 12, 13, 13, 14, 16, 11, 18, 12, 17

Here, (even number)

Mean =

= = 13.5

Mean deviation about median =

= = 2.33


4. 36, 72, 46, 42, 60, 45, 53, 46, 51, 49

Ans. Arranging the data in ascending order, 36, 42, 45, 46, 46, 49, 51, 53, 60, 72

Here, (even number)

Mean = = = 47.5

Mean deviation about median =

= = 7


Find the mean deviation about the mean for the data in Exercises 5 and 6.

5.

Ans.

Mean

= = 14

Mean deviation about mean =

= = 6.32


6.

Ans.

Mean

= = 50

Mean deviation about mean =

= = 16


Find the mean deviation about the median for the data in Exercises 7 and 8.

7.

Ans.

Here, = 13 and = 7

Median = 7

Mean deviation about median =

= = 3.23


8.

Ans.

Here, = 14.5 and = 21

Median = 30

Mean deviation about median =

= = 5.1


Find the mean deviation about the mean for the data in Exercises 9 and 10.

9.

Ans.

Mean

= = 358

Mean deviation about mean =

= = 157.92


10.

Ans.

Mean

= = 125.3

Mean deviation about mean =

= = 11.28


11. Find the mean deviation about median for the following data:

Ans.

Here, = 25

Median class = 20 – 30

Median =

= 20 + 7.86 = 27.86

Mean deviation about median =

= = 10.37


12. Calculate the mean deviation about median age for the age distribution of 100 persons given below:

Ans.

Here, = 50

Median class = 35.5 – 40.5

Median =

= 35.5 + 2.5 = 38

Mean deviation about median =

= = 7.35

myCBSEguide App

Test Generator

Create question paper PDF and online tests with your own name & logo in minutes.

Create Now
myCBSEguide App

myCBSEguide

Question Bank, Mock Tests, Exam Papers, NCERT Solutions, Sample Papers, Notes

Install Now

6 thoughts on “NCERT Solutions class-11 Maths Exercise 15.1”

Leave a Comment