Banz4687 Banz4687

17-02-2018
Mathematics

contestada

25 students average 84 on a test. another group of 20 students averages 66. find the overall average.

Respuesta :

17-02-2018

84*25=sum of all 25 students marks
66*20=sum of 20 students marks
total average=(84*25+66*20) / 25+20
=(2100+1320)/45
= 3420/45
=76

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