If a group of 50 students has an average weight of 55 kg and another group of 30 students has an average weight of 45 kg, the combined average is: MCQ with Answer and Explanation

Explanation:
Extraction from government census publications is a source of secondary data, not a method for collecting primary data, which requires firsthand gathering by the investigator.

Explanation:
Perinatal mortality reflects the quality of antenatal care, skilled attendance at birth, and immediate newborn care, making it a sensitive measure for evaluating maternal-child health programs.

Explanation:
De jure census counts individuals at their usual or legal residence, regardless of location on census day, providing data for administrative and planning purposes based on habitual residence.