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Calculate the Mean of Each Distribution Below, and Then Use

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Calculate the mean of each distribution below, and then use the means to calculate the weighted mean.  Group 1 249 Group 2 5354 Group 3 788397\begin{array} { l l l l l l l } \text { Group 1 } & 2 & 4 & 9 & & & \\\text { Group 2 } & 5 & 3 & 5 & 4 & & \\\text { Group 3 } & 7 & 8 & 8 & 3 & 9 & 7\end{array}

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