Let $$M, M_d, M_o$$ denote mean, median and mode and $$Q_1, Q_2$$ and $$Q_3$$ quartile points. Which of the following is an absolute measure of skewness?

A

$$S_k = M + M_o$$

B

$$S_k = M + M_d$$

C

$$S_k = (Q_3 - M_d) + (M_d - Q_1)$$

D

$$S_k = \frac{[(Q_3 - M_d) - (M_d - Q_1)]}{Q_3 - Q_1}$$