the mean weight of 25 boys in group A of class is 61 kg and the mean weight of 35 boys in group B of the same class is 58 kg find the mean weight of 60 boys

Ñäréñdrã Bãhûbälî

May 23, 2017, noon

Answers!

Davneet Singh

May 23, 2017, 12:10 p.m.

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

Comment