A population is made up of r disjoint subgroups. Let pi denote the proportion of the population

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A population is made up of r disjoint subgroups. Let pi denote the proportion of the population that is in subgroup i, i = 1, . . . , r. If the average weight of the members of subgroup i is wi, i = 1, . . . , r, what is the average weight of the members of the population?
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