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RD Chapter 7 Statistics Ex 7.3 Solutions

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 : -


Question - 7 : -

Answer - 7 : -


Question - 8 : -

Answer - 8 : -


Question - 9 : -

Answer - 9 : -


Question - 10 : -

Answer - 10 : - Let assumed mean = 20

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