The average weight of 18 boys in a class is 45 kg and that of the remaining 8 boys is 48.75 kg. Find the average weight (in kg) of all the boys in the class.(Correct to two decimal places)
Answer & explanation
Correct answer: option 3
Sum of weights of 18 boys = 18 x 45 = 810
Sum of weights of remaining 8 boys = 8 x 48.75 = 390
Average weight of whole class = \(\frac{810 + 390}{26}\) = 46.15 kg