The average weight of 10 person's increases by 2.5 kg when a new person comes in place of one of them weighing 50 kg. What might be the weight of the new person?  Choose the correct option.
A) 76 kg B) 76.5 kg C) 75 kg D) data inadequate E) none of these

Rationale: "explanation : total weight increased = ( 10 x 2.5 ) kg = 25 kg . weight of new person = ( 50 + 25 ) kg = 75 kg . answer : c"
Answer: C