For a certain frequency distribution, the value of mean is 20 and mode is 11. Find the value of median.


Ans.
Mean – Mode = 3 (Mean – Median)
20 – 11 = 3 (20 – Median)
∴ 9 = 3 (20  - Median)
9/3 = 20 – Median
∴ 3 = 20 – Median
∴ Median = 20 – 3
∴ Median = 17


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