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  4. Let n be an odd natural number such that the variance of 1,2,3,4, ldots, n is 14 . Then n is equal to

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Q. Let $n$ be an odd natural number such that the variance of $1,2,3,4, \ldots, n$ is $14 .$ Then $n$ is equal to ____

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Solution:

$\frac{ n ^{2}-1}{12}=14$
$ \Rightarrow n =13$