Ivan91 wrote:
What about D ) ???
Surely, at least one physician needs to earn less than the lowest paid dietitian in ordar to bring the average income of physicians (42 000) to be less than the one of dietitians (50,000) ?
This is a weighted average question .
we can have D a set in which salary starts from 1,2,3,4,5,6,7,8,9....\(50000*N\) ,
at the same time we can have set P which start with 2,3,4,5,6,7,8,9.....\(42000*K\)
now we can see there is no element in set P which is lower than the lowest element in set D .
As for answer choice C , why is this correct ? it is correct because if there is no employee who earned less than the average of P group then the average should go above 42000 K .
it is a weighted avg . question
(50000*D + 42000*K)/(N+K) = 40000
now if none of the member in K earned less than 42000 then this average would never be less than 42000.