Question

The variance of 1,2...., n is 24. Find n​

Answer 1

Answer:

1,2...n means that this is the variance of natural numbers so-

$((n - 1)(n + 1)) \div 12 = 24 \\ \ {n}^{2} - 1 = 288 \\ {n}^{2} = 289 \\ n = 17$

this is the answer.

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