If X¯1,X¯2,...,X¯k are the means of n group with n1,n2,...,nk number of observations respectively, then the mean X¯ of all the groups taken together is govern by (a) ∑i=1kni X¯i(b) 1n2∑i=1k ni X¯i(c) ∑i=1k ni X¯i∑i=1k ni(d) ∑i=1k ni X¯i2n

If X¯1,X¯2,...,X¯k are the means of n group with n1,n2,...,nk numb

1.	If X¯1,X¯2,...,X¯k are the means of n group with n1,n2,...,nk number of observations respectively, then the mean X¯ of all the groups taken together is govern by (a) ∑i=1kni X¯i(b) 1n2∑i=1k ni X¯i(c) ∑i=1k ni X¯i∑i=1k ni(d) ∑i=1k ni X¯i2n
Answer» If ${\bar{X}}_{1}, {\bar{X}}_{2}, . . ., {\bar{X}}_{k}$ are the means of n group with n1,n2,...,nk number of observations respectively, then the mean $\bar{X}$ of all the groups taken together is govern by $(a) \sum_{i = 1}^{k} n_{i} {\bar{X}}_{i} (b) \frac{1}{n^{2}} \sum_{i = 1}^{k} n_{i} {\bar{X}}_{i} (c) \frac{\sum_{i = 1}^{k} n_{i} {\bar{X}}_{i}}{\sum_{i = 1}^{k} n_{i}} (d) \frac{\sum_{i = 1}^{k} n_{i} {\bar{X}}_{i}}{2_{n}}$

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If X¯1,X¯2,...,X¯k are the means of n group with n1,n2,...,nk number of observations respectively, then the mean X¯ of all the groups taken together is govern by (a) ∑i=1kni X¯i(b) 1n2∑i=1k ni X¯i(c) ∑i=1k ni X¯i∑i=1k ni(d) ∑i=1k ni X¯i2n

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