Question

the mean weight of a class of 20 students is 48 kg .2 more students weighing 60 kg and 58 kg respectively join the class what is the mean weight of the class now?

Answer 1

Mean Weight=48 out of 20 students
Therefore total weight = 20*48 = 960
Add two students weighing 60, 58 to 960 = 960+60+58 = 1078
Therefore, Mean = 1078/22 students
= 49Kg

Answer 2

mean weight is equal to 20 x 48 = 960

add two more students =58 + 60 + 960 =1078

so number of students =22

1078 / 22 =49 kg