If `x_(1),x_(2)……..x_(n)` be n observation and `barx` be their arithmetic mean .Then formula of the standard deviation is given by

Let x_(1),x_(2),……,x_(n) be n observations and barx be their arithmetic mean. The formula for the standard deviation is

Let x_(1), x_(2),….., x_(n) be n observations and x be their arithmetic mean. The formula for the standard deviation is given by :

Let x_1, x_2 ,…………,x_n be n observations and barx be their arithmetic mean. The formula for the standard deviation is given by ……….. .

Let x_1, x_2, ... ,x_n be n observations and barX be their arithmetic mean. The standard deviation is given by (a) sum_(i=1)^n(x_i- barX )^2 (b) 1/nsum_(i=1)^n(x_i- barX )^2 (c) sqrt(1/nsum_(i=1)^n(x_i- X )^2) (c) 1/nsum_(i=1)^n x_i^2- barX ^2

Let x_(1),x_(2),x_(n) be n observations and X be their arithmetic mean.The standard mean is given by sum_(i=1)^(n)(x_(i)-X)^(2) (b) (1)/(n)sum_(i=1)^(n)(x_(i)-X)^(2) (c) sqrt((1)/(n)sum_(i=1)^(n)(x_(i)-X)^(2))( c) (1)/(n)sum_(i=1)^(n)xi2-X^(2)

Let x_(1),x_(2) ,……., x_(n) be n observations, and let barx be their arithmetic mean and sigma^(2) be the variance. Statement-1 : Variance of 2x_(1),2x_(2),…….,2x_(n) is 4sigma^(2) . Statement-2 : Arithmetic mean of 2x_(1),2x_(2),…...,2x_(n) is 4barx .

Let x_(1),x_(2),x_(3),……..,x_(n) be n observations with mean barx and standard deviation sigma . The mean the standard deviation of kx_(1),kx_(2),……,kx_(n) respectively are (i) barx,ksigma (ii) kbarx,sigma (iii) kbarx,ksigma (iv) barx,sigma

Let x_1,x_2,……,x_n be n observations, and let barx be their arithimetic mean and sigma^2 be their variance. Statement1: Variance of 2x_1, 2x_2,…..,2x_n is 4 alpha^2 Statement2: Arithmetic mean of 2x_1, 2x_2,…..,2x_n is 4 barx .

A set of n value x_(1),x_(2),……..,x_(n) has mean barx and standard deviation sigma . The mean and standard deviation of n values (x_(1))/(k),(x_(2))/(k),.......,(x_(n))/(k)(kne0 respectively are (i) kbarx,(sigma)/(k) (ii) (barx)/(k),(sigma)/(k) (iii) kbarx,ksigma (iv) (barx)/(k),ksigma

If barx_(1), barx_(2), barx_(3),………barx_(n) are the means of n groups with n_(1), n_(2), …………,n_(n) number of observations, respectively, then the mean barx of all the groups taken together is given by