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  9. Q148

RRB Group D (Level-1 posts) 2022 · Question 148 of 598

The mean of 36 numbers was found as 42. Later on, it was determined that a number 47 was misread as 41. Find the correct mean of the given numbers (rounded off to two decimal places).

  1. A43.74
  2. B42.17Correct
  3. C42.83
  4. D43.62

Answer: B. 42.17

Explanation

Correct mean = (sum of 36 numbers + 6) / 36 = 42.17 (after correcting the misread value).

Source: RRB Group D 2022 Prev. Yr. Paper (17 Aug 2022) (Shift 2) - Prepp · reliable-secondary

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