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NCERT solution class 9 chapter 14 Statistics exercise Exercise 14.1 mathematics


Page No 239:

Question 1:

Give five examples of data that you can collect from day to day life.


In our day to day life, we can collect the following data.

1. Number of females per 1000 males in various states of our country

2. Weights of students of our class

3. Production of wheat in the last 10 years in our country

4. Number of plants in our locality

5. Rainfall in our city in the last 10 years

Question 2:

Classify the data in Q1 above as primary or secondary data.


The information which is collected by the investigator himself with a definite objective in his mind is called as primary data whereas when the information is gathered from a source which already had the information stored, it is called as secondary data. It can be observed that the data in 1, 3, and 5 is secondary data and the data in 2 and 4 is primary data


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