Correct option is C
Introduction
In climatology, rainfall variability is commonly compared between different places or time periods. Since rainfall amounts often have different means, the most appropriate measure is the Coefficient of Variation (CV), which expresses variability relative to the mean.
Additional Knowledge
Common Measures of Dispersion
Measure | Use |
|---|---|
Range | Difference between maximum and minimum |
Mean Deviation | Average deviation from the mean |
Standard Deviation | Absolute dispersion |
Coefficient of Variation (CV) | Relative variability (best for rainfall) |
Interquartile Range (IQR) | Spread of the middle 50% of data |
Interpretation of Rainfall CV
- CV < 20% → Low variability (reliable rainfall)
- 20–30% → Moderate variability
- CV > 30% → High variability (unreliable rainfall)
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