There are two sections A and B of a class, consisting of 36 and 44 students respectively. If the average weight of section A is 40kg and that of section B is 35kg, find the average weight of the whole class?

🧠 Explanation:

A class with section A (36 students, 40 kg average weight) and section B (44 students, 35 kg average weight) has a total average weight of 37.25 kg. Total weight = (36 × 40) + (44 × 35) = 1440 + 1540 = 2980 kg. Total students = 36 + 44 = 80. Average = 2980 ÷ 80 = 37.25 kg. This problem tests weighted averages, key in statistics, education, or data analysis, ensuring accurate group metrics in practical applications.