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  9. Q310

RRB Group D (Level-1 posts) 2022 · Question 310 of 598

A class of 30 students appeared in a test. The average score of 12 students is 80, and that of the rest is 75. What is the average score of the class?

  1. A56
  2. B67
  3. C87
  4. D77Correct

Answer: D. 77

Explanation

The total score for 12 students is 12 × 80 = 960, and for the remaining 18 students, it is 18 × 75 = 1350. Therefore, the combined total score for all 30 students is 960 + 1350 = 2310. To find the average score, divide the total score by the number of students: 2310 ÷ 30 = 77.

Source: RRB Group D 2022 Prev. Yr. Paper (18 Aug 2022) (Shift 2) - Prepp · reliable-secondary

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