Multiple choice

The mean, median and standard deviation of 100 observations are found to be 90, 84 and 72 respectively, then Karl Pearson's coefficient of skewness is:

  1. 0.25

  2. 0.33

  3. 0.66

  4. 0.11

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AI explanation

Karl Pearson's coefficient of skewness is calculated using the formula 3 multiplied by the mean minus the median, all divided by the standard deviation. Substituting the given values into the formula gives 3 times 90 minus 84, divided by 72. This simplifies to 270 minus 84, which equals 186, and dividing 186 by 72 gives 0.25.