Classify the data in Q.1 above as primary or secondary data.
Solution:
Think about how you have collected data:
 Did you collect the data all by yourself investigating around? If yes, primary.
 Did you obtain the data from a source where the information has been stored already? If yes, secondary.
Following are the data in Q.1
 Number of houses in our housing society.

Monthly grocery expenses of our home.

Number of people who have used eservices of the state govt. over a year.

Number of students who have enrolled for the Math Olympiad in our school.

Population increase over the decade in our city.
Based on the observation, data in Q.1, 1 and 2 are primary, and the data in 3, 4, and 5 are secondary.
Video Solution:
Classify the data in Q.1 above as primary or secondary data.
NCERT Solutions for Class 9 Maths  Chapter 14 Exercise 14.1 Question 2:
Summary:
Based on the observation, we have found that data in Q.1, 1 and 2 are primary, and the data in 3, 4, and 5 are secondary.