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Railways PYQCBT 1 2020

RRB NTPC · Question 10

If the ratio of mean and median of a certain data is 4 : 5, then find the ratio of its mean and mode.

  1. 5 : 7

  2. 3 : 7

  3. 4 : 7

  4. 5 : 4

Show answer & explanation

Answer: (C) 4 : 7

Explanation

Empirically, mode = 3 median − 2 mean. With mean 4k and median 5k, mode = 15k − 8k = 7k, so mean : mode = 4 : 7.