Multiple choice

There are two sections A and B of a class, consisting of 38 and 42 students, respectively. If the average weight of the students of section A is 55 kg and that of section B is 32 kg, find the average weight of all the students in the class.

  1. 41.925 kg

  2. 42.925 kg

  3. 44.925 kg

  4. 40.925 kg
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total weight = (38 * 55) + (42 * 32) = 2090 + 1344 = 3434. Total students = 38 + 42 = 80. Average = 3434 / 80 = 42.925 kg.

AI explanation

Using the formula for combined average, we calculate the total weight of section A as 38 students times 55 kg, which equals 2090 kg. The total weight of section B is 42 students times 32 kg, giving 1344 kg. The total weight of all 80 students is 3434 kg, and dividing this by 80 gives an average weight of 42.925 kg.

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