Hi Narendra,
Mean Weight of Group A = Total Weight of Group A Students / 25
61 = Total Weight of Group A Students / 25
61 × 25 = Total Weight of Group A Students
1525 = Total Weight of Group A Students
Total Weight of Group A Students = 1525
Mean Weight of Group B = Total Weight of Group B Students / 35
58 = Total Weight of Group B Students / 35
58 × 35 = Total Weight of Group B Students
2030 = Total Weight of Group B Students
Total Weight of Group B Students = 2030
Thus,
Total Weight of 60 boys = Total weight of Group A students + Total Weight of Group B students
Total Weight of 60 boys = 1525 + 2030
Total Weight of 60 boys = 3555
Now,
Mean Weight of 60 boys = Total Weight of 60 boys / 60
Mean Weight of 60 boys = 3555/60
Mean Weight of 60 boys = 59.25
Written on May 23, 2017, 12:10 p.m.