Discussion
The variability of rainfall is best represented by which of the following technique ?
Answer: C
Rainfall variability is best represented by the Coefficient of variation.
\[ CV = \frac{\sigma}{\bar{x}} \times 100 \]
The coefficient of variation expresses the standard deviation as a percentage of the mean, so it allows places with very different average rainfall to be compared. A desert and a wet coast may have similar standard deviations, but the CV shows that the desert's rainfall is far less reliable.
Mean deviation, standard deviation and interquartile range are absolute measures in millimetres, which cannot be compared fairly between places with different means.
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