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the case of the unknown average

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gougdh
 
Reply Mon 24 Feb, 2014 11:36 am
I know the average of a group that consists of two subgroups. I know the number in the two subgroups and of course then the total. I know the average of one of the subgroups. How can I work out the 0average of the other subgroups...(Basically overall average of group of say 200 is 65%, subgroup B which is 150 has an average of 70%. Sub group C is 50. What is the average score pf sibgroup C)
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Type: Question • Score: 0 • Views: 660 • Replies: 1
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neologist
 
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Reply Mon 24 Feb, 2014 12:08 pm
@gougdh,
(150)(70) + (50)(x) = (200)(65)
10500 +50x = 13000
50x= 2500
x=50
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