The variance of first 20 -natural number is....
The variance of first 20 -natural number is
\( \mathrm{P} \)
(1) \( \frac{133}{4} \)
(2) \( \frac{379}{12} \)
(3) \( \frac{133}{2} \)
(4) \( \frac{399}{4} \)
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