The average (arithmetic mean) of the 11 numbers in a list is 14. If the average of 9 of the numbers in the list is 9, what is the average of the other 2 numbers?
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average of 11 numbers= 14
sum of 11 numbers= 14*11= 154
average of 9 numbers = 9
sum of 9 numbers= 9*9=81
sum of 2 numbers remaining
=sum of 11 nos - sum of 9 nos
= 73
avg of 2 nos=sum of 2 nos÷2
=36.5
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mean=sum of numbers,n/no. of observations
thus,14=n/11
n=154
Similarly,9=n/9
in this case the sum of the 9 no.s=81
thus,difference of the sum of 11 and 9 numbers=154-81=73
again, mean =sum of observations/no. of observations
=73/2
average=36.5
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