R s aggarwal mathematics class 7 Solutions for Chapter 21 collection and organisation of data mean median mode

Exercises in Chapter 21 collection and organisation of data mean median mode Grade 7

Collection and Organisation of Data (Mean, Median, Mode) Exercise 21A

Collection and Organisation of Data (Mean, Median, Mode) Exercise 21B

Collection and Organisation of Data (Mean, Median, Mode) Exercise 21C

Questions in Collection and Organisation of Data (Mean, Median, Mode) Exercise 21A

Define the terms:

(i) Data

(ii) Raw data

(iii) Array

(iv) Tabulation of data

(v) Observation

(vi) Frequency of an observation

(vii) Statistics

A die was thrown 20 times and the following outcomes were recorded:

5, 2, 1, 3, 4, 4, 5, 6, 2, 2, 4, 5, 5, 6, 2, 2, 4, 5, 5, 1.

Arrange the above data in ascending order and prepare the frequency table.

The daily wages (in ₹) 0f 15 workers in a factory are given below:

400, 360, 300, 300, 260, 360, 360, 400, 300, 260, 360, 360, 400, 300, 360

Arrange the above data in ascending order and prepare the frequency table.

Write the data given below in ascending order and prepare the frequency table.

7, 8, 7, 10, 6, 8, 9, 7, 10, 5, 7, 6, 8, 5, 6, 7, 8, 9, 7, 6, 7, 8

Fill in the blanks:

(i) Data means information in the form of …… figures.

(ii) Data obtained in the ……… form is called raw data.

(iii) Arranging the numerical figures in ascending or descending order is called an ……..

(iv) The number of times a particular observation occurs is called its ……….

(v) Arranging the data in the form of a table is called ……… of data.

Find the mean of first five natural numbers.

Find the mean of first six odd natural numbers.

Questions in Collection and Organisation of Data (Mean, Median, Mode) Exercise 21B

Find the median of:

(i) 3, 11, 7, 2, 5, 9, 9, 2, 10

(ii) 9, 25, 18, 15, 6, 16, 8, 22, 21

(iii) 21, 15, 6, 25, 18, 13, 20, 9, 16, 8, 22

Find the median of:

(i) 10, 32, 17, 19, 21, 22, 9, 35

(ii) 55, 60, 35, 51, 29, 63, 72, 91, 85, 82

Find the median of first 15 odd numbers.

Find the median of first 10 even numbers.

Find the median of first 50 whole numbers.

Questions in Collection and Organisation of Data (Mean, Median, Mode) Exercise 21C

Find the mode of the data:

(i) 10, 8, 4, 7, 8, 11, 15, 8, 6, 8

(ii) 27, 23, 39, 18, 27, 21, 27, 27, 40, 36, 27

The ages (in years) of 11 cricket players are given below:

28, 34, 32, 41, 36, 32, 32, 38, 32, 40, 31

Find the mode of the ages.

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Chapters in this book

Integers

Fractions

Decimals

Rational Numbers

Exponents

Algebraic Expressions

Linear Equations in one variable

Ratio and Proportion

Unitary Method

Percentage

Profit and Loss

Simple Interest

Lines and Angles

Properties of Parallel Line

Properties of Triangles

Congruence

Constructions

Reflection and Rotational Symmetry

Three-Dimensional Shapes

Mensuration

Collection and Organisation of Data (Mean, Median, Mode)

Bar Graphs

Probability

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