The first group of students consists of 10 third divisioners with mean marks 36,15 second divisioners with mean marks 56 and 25 first divisioners with 64 as their mean marks.second group of students consists of 13 third divisioners,17 second divisioners and 20 first divisioners with mean marks 45,55 and 74 respectively.calculate combined mean of two groups separately and then the combined mean of the groups taken together.
Dear Student,
Combined Mean of first group = (10×36+15×56+25×64)/10+15+25 = 2800/50 = 56
Combined Mean of second group = (13×45+17×55+20×74)/13+17+20 = 3000/50 = 60
Combined Mean of both the groups = (50×56 + 50×60)/50+50 = 5800/100 = 58
Regards
Combined Mean of first group = (10×36+15×56+25×64)/10+15+25 = 2800/50 = 56
Combined Mean of second group = (13×45+17×55+20×74)/13+17+20 = 3000/50 = 60
Combined Mean of both the groups = (50×56 + 50×60)/50+50 = 5800/100 = 58
Regards