Latest NDA Aptitude Question SOLUTION: The standard deviation of the observations 5, 5, 5, 5, 5 is (a) 0 (b) 5 (c) 20 (d) 25

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(#M40026487) NDA question Mental Ability Keep an EYE

The standard deviation of the observations 5, 5, 5, 5, 5 is
(a) 0 (b) 5 (c) 20 (d) 25

Asked In NDA MAN (10 years ago)

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priyanka singh  (6 years ago)

Standard deviation is nothing but the square root of variance.
And variance of a series will be defined as the extend of variation among it's members I.e. how much one observation differ from another.
The above series has 5 members and they all have the same magnitude I.e.5
This implies that there is no variation in the series. Hence variance should be 0.
As I described above, S.D=sq.root of var.
=Sq.root of 0
S.D=0

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