elishane2651 elishane2651
  • 09-12-2022
  • Mathematics
contestada

A population is made up of r disjoint subgroups. Let Pi denote the proportion of the population that is in sub- group i,i = 1,...,7. If the average weight of the members of subgroup i is w;,i = 1, ...,r, what is the average weight of the members of the population?

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