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The standard deviation (sigma) of variat...

The standard deviation `(sigma)` of variate x is the square root of the A.M. of the squares of all deviations of x from the A.M. observations.
If `x_i//f_i`, i=1,2,… n is a frequency distribution then `sigma=sqrt(1/N Sigma_(i=1)^(n) f_i(x_i-barx)^2), N=Sigma_(i=1)^(n) f_i` and variance is the square of standard deviation. Coefficient of dispersion is `sigma/x` and coefficient of variation is `sigma/x xx 100`
The standard deviation for the set of numbers 1,4,5,7,8 is 2.45 then coefficient of dispersion is

A

4.9

B

2.04

C

0.49

D

2.45

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