AP ICET 2015 Paper

Question : 144 of 200

Marks: +1, -0

The standard deviation of first 13 natural numbers is

Solution:

The set of first 13 natural numbers are in A.P.
n = 13, d = 1
S.D. of n observations in A.P.

=d√{n^{2-1}/12}

=√{{(13)^{2}-1}/{12}}=√{\;\;{168}/{12}}=√{14}

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