Question 17 If ¯x1,¯x2,¯x3,……¯xn, are the means of n groups with n1,n2,nn number of observations, respectively. Then the mean ¯x of all the groups: A) ∑ni=1ni¯xi B) ∑ni=1ni¯xin2 C) ∑ni=1ni¯xi∑ni=1ni D) ∑nni¯xi2n

Question 17 If ¯x1,¯x2,¯x3,……¯xn, are the means of n groups wi

1.	Question 17 If ¯x1,¯x2,¯x3,……¯xn, are the means of n groups with n1,n2,nn number of observations, respectively. Then the mean ¯x of all the groups: A) ∑ni=1ni¯xi B) ∑ni=1ni¯xin2 C) ∑ni=1ni¯xi∑ni=1ni D) ∑nni¯xi2n
Answer» Question 17 If $_{1},_{2},_{3}, \dots \dots_{n}$ , are the means of n groups with $n_{1}, n_{2}, n_{n}$ number of observations, respectively. Then the mean $¯ x$ of all the groups: A) $\sum_{i = 1}^{n} n_{i}_{i}$ B) $\frac{\sum_{i = 1}^{n} n_{i}_{i}}{n^{2}}$ C) $\frac{\sum_{i = 1}^{n} n_{i}_{i}}{\sum_{i = 1}^{n} n_{i}}$ D) $\frac{\sum^{n} n_{i}_{i}}{2 n}$

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Question 17 If ¯x1,¯x2,¯x3,……¯xn, are the means of n groups with n1,n2,nn number of observations, respectively. Then the mean ¯x of all the groups: A) ∑ni=1ni¯xi B) ∑ni=1ni¯xin2 C) ∑ni=1ni¯xi∑ni=1ni D) ∑nni¯xi2n

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