Read the original condition carefully
Department XFactoryWhen information about one area is given and it is asking about another, automatically think of weighted averages.
\(w_dx_d\)+\(w_fx_f\)/n
Where w is weight, x is average, d is department, f is factory, n is total number of workers
1) Gives \(x_d\), but not the others. Insufficient
2) Gives \(x_f\), but not the others. Insufficient.
Together, insufficient.
EAlso the difficulty of knowing whether to include
department workers in the
factory total. Probably should.
In this example, doing it without inclusion for simplicity
1 worker in department, 99 in factory
\(\frac{(15,000+99·20,000)}{100}\) = 19,950
99 workers in department, 1 in factory
\(\frac{(99·15,000+20,000)}{100}\)=15,050
Bunuel do you write these questions?