Maharashtra State Board Class 9 Maths Solutions Chapter 7 Statistics Practice Set 7.2
Classify following information as primary or secondary data.
i. Information of attendance of every student collected by visiting every class in a school
ii. The information of heights of students was gathered from school records and sent to the head office, as it was to be sent urgently.
iii. In the village Nandpur, the information collected from every house regarding students not attending school.
iv. For science project, information of trees gathered by visiting a forest.
i. Primary data
ii. Secondary data
iii. Primary data
iv. Primary data