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RD Chapter 7- Statistics Ex-7.3 Interview Questions Answers

Question 1 :
The following table gives the distribution of total household expenditure (in rupees) of manual workers in a city.
 
Find the average expenditure ( in rupees ) per household.

Answer 1 :


Question 2 :
A survey was conducted by a group of students as a part of their environment awareness programme, in which they collected the following data regarding the number of plants in 20 houses in a locality. Find the mean number of plants per house.
 
Which method did you use for finding the mean, and why ?

Answer 2 : Let assumed mean (A) = 7

Question 3 :
Consider the following distribution of daily wages of 50 workers of a facotry.
 
Find the mean daily wages of the workers of the factory by using an appropriate method.

Answer 3 :


= 150 – 4.80 = 145.20
Mean daily wages per worker = Rs. 145.20

Question 4 :
Thirty women were examined in a hospital by a doctor and the number of heart beats per minute recorded and summarised as follows. Find the mean heart beats per minute for these women, choosing a suitable method.
 
Find the mean of each of the following frequency distribution (5 – 14)

Answer 4 :


Hence heart beats per minute = 75.9

Question 5 : Find the mean of each the following frequency distributions : (5 – 14)

Answer 5 :

Let Assumed mean (A) =15

Question 6 :

Answer 6 :