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Railways PYQCBT 1 2016

RRB NTPC · Question 91

Since a student's marks were mistakenly typed 86 instead of 68, the mean of the class increased by 1/2. What is the total number of students. A. 34 B. 36 C. 38 D. 40

  1. B

  2. A

  3. C

  4. D

Show answer & explanation

Answer: (A) B

Explanation

The wrong entry raised the total by 86 − 68 = 18, which raised the mean by 1/2. So the number of students = 18 ÷ 1/2 = 36.