RRB NTPC 28 April 2016 Paper

Question : 46 of 100

Marks: +1, -0

If the Standard deviation of a distribution is 9, what is the value of variance?

Solution:

(3) Standard Deviation = 9
We know that Standard Deviation is the square root of variance.
Hence,
9 =

√\variance

⇒ variance = 81

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