Let M, Md, M0 denote mean, median and mode and Q1, Q2 and Q3 quartile points. Which of the following is an relative measure of skewness?

1
Sk = M + M0
2
Sk = M + Md
3
Sk = (Q3 - Md) + (Md - Q1)
4
\(S_k = \dfrac{[(Q_3-M_d) - (M_d-Q_1)]}{Q_3-Q_1}\)

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