A population is made up of r disjoint subgroups.Let pi
Chapter 7, Problem 7.52(choose chapter or problem)
A population is made up of r disjoint subgroups.Let pi denote the proportion of the population thatis in subgroup i, i = 1, . . . , r. If the average weightof the members of subgroup i is wi, i = 1, . . . , r,what is the average weight of the members of thepopulation?
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