Ans. A study was conducted in Delhi to determine the average weight of seventh-grade students. The total number of students in seventh grade was 2860. These 200 students were chosen at random and their weight was recorded.
In this case:
(i) The population is the total number of seventh-grade students in Delhi, which is 2860.
(ii) The sample consists of the 200 students whose weights were recorded.
(iii) The weight of the students is the variable under investigation.