The average weight of 17 students of a class is 56 kg. 3 new students whose weights are 57, 62 and 68 kg, respectively, join the class. Find the new average weight of the students of the class.

56.95 kg

Sum of weight of 17 students = 17 × 56 = 952 kg

Sum of weight of all 20 students = 952 + 57 + 62 + 68 = 1139 kg

Average  weight = \(\frac{1139}{20}\) = 56.95 kg