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Exercises · Q9

Q.The mean of a distribution is 3232, its mode is 3535 and its standard deviation is 66. Find Karl Pearson's coefficient of skewness and state the type of skewness.

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✓ Free question

Given: Mean xˉ=32\bar{x} = 32, Mode Z=35Z = 35, σ=6\sigma = 6.

Skp=xˉ−Zσ=32−356=−36=−0.5.Sk_p = \frac{\bar{x} - Z}{\sigma} = \frac{32 - 35}{6} = \frac{-3}{6} = -0.5. The negative value shows the distribution is negatively (left) skewed.

Verification (dual solve). The sign is consistent with the averages: since xˉ=32<Z=35\bar{x} = 32 < Z = 35, the mean lies below the mode, which is exactly the mean-below-mode pattern of a negatively skewed distribution. The magnitude 0.50.5 lies well within the practical range [−1,1][-1, 1], so the result is admissible.

✓Final answer

Skp=−0.5Sk_p = -0.5; the distribution is negatively skewed.

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