Another formula to calculate mode other than the most repeating values in data

i have seen in some textbooks, where we calculate mode as per the below empirical formula;

mode = 3 * median - 2 * mean

do you have any thoughts on how this formula is to be understood. not sure if we will discuss in the upcoming videos on stat.

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  1. Simple Explanation:
    http://pinkmonkey.com/studyguides/subjects/stats/chap4/s0404601.asp

  2. Detailed Explanation with proof:
    https://stats.stackexchange.com/questions/3787/

In essence, the formula you quoted only works for moderately skewed or asymmetrical distributions.

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