The average weight of 31 students of section A of a class is 53 kg, whereas the average weight of 27 students of section B of the same class is 55 kg. Find out average weight of all the 58 students of the class.
53.9 kg . [ ( 31 * 53) + (27 * 55) ] / (27 + 31)
When a boy weighing 47 kg left a group, the average weight of the remaining 49 students increased by 300 g. What is the average weight of the remaining 49 students?
The average weight of 56 students is 56 kg. It was found later that the figure of 45 kg was misread as 54 kg. What is the correct average?
The average weight of 19 students was 50 kg. By the admission of a new student the average weight is reduced to 49.6 kg. What is the weight of the new student?
The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.
The average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60. What is the average marks of all the students?
