If `barx` represents the mean of n observations `x_(1), x_(2),………., x_(n)`, then values of `Sigma_(i=1)^(n) (x_(i)-barx)`

If barx represents the mean of n observations x_1, x_2,…….,x_n , then value of sum_(i=1)^n (x_1-barx) is :

If barx is the mean of n observations x_(1),x_(2),x_(3)……x_(n) , then the value of sum_(i=1)^(n)(x_(i)-barx) is (i) -1 (ii) 0 (iii) 1 (iv) n-1

If barx is the mean of n observations x_(1),x_(2),x_(3)……x_(n) , then the value of sum_(i=1)^(n)(x_(i)-barx) is (i) -1 (ii) 0 (iii) 1 (iv) n-1

The mean and variance of n observations x_(1), x_(2), x_(3),……..,x_(n) are 5 and 0 respectively. If sum_(i=1)^(n) x_(i)^(2) = 400 , then the value of n is equal to

A data consists of n observations : x_(1), x_(2),……, x_(n) . If Sigma_(i=1)^(n)(x_(i)+1)^(2)=11n and Sigma_(i=1)^(n)(x_(i)-1)^(2)=7n , then the variance of this data is

A data consists of n observations : x_(1), x_(2),……, x_(n) . If Sigma_(i=1)^(n)(x_(i)+1)^(2)=11n and Sigma_(i=1)^(n)(x_(i)-1)^(2)=7n , then the variance of this data is

If Sigma_(i=1)^(2n) cos^(-1) x_(i) = 0 ,then find the value of Sigma_(i=1)^(2n) x_(i)

If Sigma_(i=1)^(2n) cos^(-1) x_(i) = 0 ,then find the value of Sigma_(i=1)^(2n) x_(i)

If barx is the mean of x_(1), x_(2), …………., x_(n) , then for a ne 0 , the mean of ax_(1), ax_(2),…….., ax_(n), x_(1)/a, x_(2)/a, ……….., x_(n)/a is