Select the correct answerThe average weight of a certain number of students in a group is 72 kg. If 10 students having an average weight of 78 kg leave and 4 students having an average weight of 80 kg join the group, the average weight of the students in the decreases by 0.7 kg. The number of students initially in the group is?Options46445456

The average weight of 30 students is 45 kg. 15 students whose average weight is 48 kg left the class and 10 students whose average weight is 50 kg joined the class, and then find the new average weight of the students in the class.a45.2b45.4c45.6d45.8

The average weight of N boys in a Group is 36 kg.If 20 other boys whose average weight is 30 kg join the the group, the average weight of the group would be the same as what it would be if 5 boys whose average weight is 40 kg leave the group. Find N.a.20b.15c.10d.25

Select the correct answerOut of a class of 64 people ,7 people of average weight 61 kg leave, and immediately 3 people weighing 70kg ,77 kg and 68 kg join. there by making the new average weight of the class 69 kg. What was the original average weight of the class of 64 people?Options6890675970

A, B, C and D are four friends, each of whom weighs less than 100 kg. From amongst them they form a group and find the total weight of that group. If the sum of the total weights of all possible distinct groups, each having the same number of members as in the first is 882 kg, then what is the average weight of the four friends?1 point41.75 kg63.5 kg73.5 kgnone of these

The mean weight of a class of  39 students is  40 kg. When a new student is admitted, the mean weight decreases by  200 g. Find the weight of new student.