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Sahay Sir > Question Answers > NCERT Class 9 > Maths > Chapter 14 - Statistics > 17. If 1x , 2 x , 3 x , … , n x are the means of n groups with n1 , n2 , … , nn number of observations respectively, then the mean x of all the groups taken together is given by :

17. If 1x , 2 x , 3 x , … , n x are the means of n groups with n1 , n2 , … , nn number of observations respectively, then the mean x of all the groups taken together is given by :

... 17. If 1x 2 x 3 x n x are the means of n groups with n1 n2 nn number of observations respectively then the mean x of all the groups taken together is given by :