Discussion
Assertion (A): A gamma distribution is often preferred to a pure exponential for raindrop spectra.
Reason (R): The extra shape parameter represents the observed shortage of the very smallest drops.
Answer: D
Both are true and the reason gives the improvement, and the exponential form overpredicts small drops. The additional parameter must itself be estimated, which is the cost of the better fit. Extra parameters need extra observations to constrain them.
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