Multiple choice

The average height of 22 students of a class is 140 cm and the average height of 28 students of another class is 152 cm. What is the average height of students of both the classes?

  1. 144.32 cm

  2. 145.52 cm

  3. 146.72 cm

  4. 147.92 cm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total height = (22 * 140) + (28 * 152) = 3080 + 4256 = 7336. Total students = 22 + 28 = 50. Average = 7336 / 50 = 146.72.

AI explanation

Using the weighted average formula, the combined average is ((22 * 140) + (28 * 152)) / (22 + 28). The total height for the first class is 3080 cm and for the second class is 4256 cm. Adding these gives 7336 cm, and dividing by the total 50 students yields an average height of 146.72 cm.

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