• +91 9971497814
  • info@interviewmaterial.com

RD Chapter 7- Statistics Ex-7.5 Interview Questions Answers

Question 1 :
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
Here we see that 15 occurs in maximum times i.e. 54

Question 2 :
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

Question 3 : Find the mode of the following distribution.

Answer 3 :


Question 4 : Compare the modal ages of two groups of students appearing for an entrance test :

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

Question 5 : The marks in science of 80 students of class X are given below: Find the mode of the marks obtained by the students in science.

Answer 5 :


We see that class 50-60 has the maximum frequency 20
It is a modal class

Question 6 :
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,