A series has its mean as `15 ` and its coefficient of variation as `20` , its standard deviation is

Find out standard deviation and coefficient of variation .

I the mean of a binomial distributions 20 and its standard deviation is 4, find p.

Calculate the standard deviation and coefficient of variation .

If the mean of 10 observation is 50 and the sum of the square of the deviations of observation from the mean is 250, then the coefficient of variation of these observation is

If coefficient of variation is 60 and standard deviation is 24, then arithmetic mean is :

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 For a given distribution of marks mean is 35.16 and its standard deviation is 19.76 then coefficient of variation is