Question

② Classify the data given below as primary or secondary data:

 Shoe size of 10 students of class 9.

 The blood groups of any 20 of your friends.

 Number of members in the families of your classmates.

 Marks obtained by 30 students in a mathematics test.

 Number of plants planted by 100 schools during Van Mahotsava.​

Answer 1

Answer:

mark obtained by 30 students in a mathematics test