If `n=5, overline(x)=6, sum x^(2)=765`, then calculate the coefficient of variation.

If n=10 , barx=12 , and sumx^(2)=1530 , then calculate the coefficient of variation.

If n = 10 , barx =12 and sum x^(2) = 1530 , then calculate the coefficient of variation.

Given sum(x-barx)^(2)=48 , barx=20 and n=12 . The coefficient of variation is .........

The standard deviation and mean of a data are 6.5 and 12.5 respectively. Find the coefficient of variation.

If the number of terms in the expansion of (1-2/x+4/(x^2))^n , x!=0, is 28, then the sum of the coefficients of all the terms in this expansion, is : (1) 64 (2) 2187 (3) 243 (4) 729

Prove that the coefficient of x^n in the expansion of (1+x)^2n is twice the coefficient of x^n in the expansion of (1+x)^2n-1 .

In p(x)=5x^(7)-6x^(5)+7x+6 , what is the (i) coefficient of x^(5) (ii) degree of p(x) (iii) consstant term.