Multiple choice

Two classes took the same test. One class of 20 students made and average grade of 80% the other class of 30 students made an average grade of 70%. The average grade for all students in both class is-

  1. 72%

  2. 74%

  3. 75%

  4. 77%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Weighted average = (20×80 + 30×70)/(20 + 30) = (1600 + 2100)/50 = 3700/50 = 74%. The weighted average accounts for different class sizes, giving 74% as the overall average.

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