$\begin{array}{1 1}(a)\;\large\frac{\sum m_iM_i}{\sum M_i}&(b)\; \large\frac{\sum m_iM_i}{\sum N_i}\\(c)\;\large\frac{\sum N_iM_i^2}{\sum N_iM_i}&(d)\;\large\frac{\sum N_iM_i}{\sum N_i}\end{array}$

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