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Drupady [299]
3 years ago
5

The mean of a set of eight numbers is 8 and the mean of a different set of twelve numbers is m. Given that the mean if the combi

ned set of twenty numbers is 5, calculate m.
Mathematics
1 answer:
Basile [38]3 years ago
8 0
Mean=total/the number of values =>total=mean*the number of values
the total of the first set of 8 numbers is : total=8*8=64
the total of the second set of 12 numbers is: 12m
the total of the 20 numbers is: 64+12m
the mean of the 20 number is: (64+12m)/20=5
solve for m: 64+12m=100
12m=36
m=3
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Total Area: T.A.=2*(4*6/2)+[4+6+2 sqrt(13)] (8)
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