the mean age of a group of 100 children was 9.35 years the mean age of 25 of them was 8.75 years and that of another 65 of them was 10.51 years whar is the mean age of the remaining children
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Answer:
The mean age of remaining children is 3.31 years
Step-by-step explanation:
Given:
Mean age of 100 children = 9.35
Sum of the ages of 100 children
=9.35*100
=935
Also given,
Mean age of 25 of them is 8.75
Mean age of 65 of them is 10.51
Let the mean age of remaining 10 of them be x
Then,
sum of the ages of 100 children
=(25*8.75)+(65*10.51)+(10*x)
=218.75+683.15+10x
=901.9+10x
But,
901.9+10x=935
10x=935-901.9
10x=33.1
x=3.31
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