Multiple choice

There are 12 students in a class. The weight of 3 students is 40 kg each. The weight of 5 students is 30 kg each. The weight of 4 students is 45 kg each. What is the mean weight of a student in the class?

  1. 95.8 kg

  2. 60 kg

  3. 37 kg

  4. 37.5 kg
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Total weight = (3 * 40) + (5 * 30) + (4 * 45) = 120 + 150 + 180 = 450. Total students = 3 + 5 + 4 = 12. Mean = 450 / 12 = 37.5.

AI explanation

The combined weight of all students is (3 times 40) + (5 times 30) + (4 times 45), which equals 450. The total number of students is 3 + 5 + 4, or 12. Dividing the total weight of 450 by 12 students gives a mean weight of 37.5 kg.

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