What is the formula for measuring skewness in a dataset?

What is the formula for measuring skewness in a dataset?
A . MEAN – MEDIAN
B . MODE – MEDIAN
C . (3(MEAN – MEDIAN))/ STANDARD DEVIATION
D . (MEAN – MODE)/ STANDARD DEVIATION

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Answer: C

Explanation:

Since the normal curve is symmetric about its mean, its skewness is zero. This is a theoretical explanation for mathematical proofs, you can refer to books or websites that speak on the same in detail.