RD Chapter 7- Statistics Ex-7.1 |
RD Chapter 7- Statistics Ex-7.2 |
RD Chapter 7- Statistics Ex-7.3 |
RD Chapter 7- Statistics Ex-7.4 |
RD Chapter 7- Statistics Ex-7.6 |

Find the mode of the following data :

(i) 3, 5, 7, 4, 5, 3, 5, 6, 8, 9, 5, 3, 5, 3, 6, 9, 7, 4

(ii) 3, 3, 7, 4, 5, 3, 5, 6, 8, 9, 5, 3, 5, 3, 6, 9, 7, 4

(iii) 15, 8, 26, 25, 24, 15, 18, 20, 24, 15, 19, 15

**Answer
1** :

We see that 5 occurs in maximum times which is 5

∴ Mode = 5

we see that 3 occurs in maximum times i.e. 5

∴ Mode = 3

∴ Mode = 3

Here we see that 15 occurs in maximum times i.e. 54

The shirt sizes worn by a group of 200 persons, who bought the shirt from a store, are as follows :

Find the model shirt size worn by the group.

**Answer
2** :

We see that frequency of 40 is maximum which is 41

∴Mode =40

**Answer
3** :

**Answer
4** :

(i) For group A

We see that class 18-20 has the maximum frequency

∴ It is a modal class

(ii) For group B

We see that class 18-20 has the maximum frequency

∴ It is a modal class

**Answer
5** :

We see that class 50-60 has the maximum frequency 20

∴ It is a modal class

∴ It is a modal class

The following is the distribution of height of students of a certain class in a certain city :

Find the average height of maximum number of students.

**Answer
6** :
Writing the classes in exclusive form,