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The mean square deviations of a set of o...

The mean square deviations of a set of observations `x_(1),x_(2), …, x_(n)` about a point c is defined to be `(1)/(n) sum_(i=1)^(n)(x_(i)-c)^(2)`. The mean square deviations about -1 and +1 of a set of observations are 7 and 3, repectively. Find the standard deviation of this set of observations.

A

3

B

2

C

1

D

none of these

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The correct Answer is:
A
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