NCERT Class 7 Mathematics Solutions: Chapter 3 –Data Handling Exercise 3.1 Part 2

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Image of how to find the mean

Image of How to Find the Mean

1. Find the mean of the first five whole numbers.

Answer:

The first five whole numbers are .

So, Mean of first five whole numbers

The mean of first five whole numbers is 2.

2. A cricketer scores the following runs in eight innings: Find the mean score.

Answer:

Number of

Mean of score

The mean score is 50.

3. Following table shows the points of each player scored in four games:

The points of each player scored in four games

Player

Game 1

Game 2

Game 3

Game 4

Did not play

(i) Find the mean to determine average number of points scored per game.

(ii) To find the mean number of points per game for , would you divide the total points by ? Why?

(iii) played in all the four games. How would you find the mean?

(iv) Who is the best performer?

Answer:

(i) Mean of player

(ii) We should divide the total points by because player played only three games.

(iii) Player played in all the four games.

Mean of player

(iv) To find the best performer, we should know the mean of all players.

Mean of player

Mean of player

Mean of player

So, on comparing mean of all players, player is the best performer.