Q. 8. The mean of ten numbers is 58. If one of the numbers is 40, what is the
mean of the other nine?
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Step-by-step explanation:
Mean = Sum of Numbers/Total Numbers
As per problem,
Sum of 10 numbers ÷ 10 = 58
We know one of the numbers is 40. So, we can rewrite the above like this
(Sum of 9 numbers÷10) + 40÷10 = 58
Sum of 9 numbers÷10 = 54
divide both sides by 10÷9, we get
Sum of 9 numbers ÷ 9 = 60
Hence, Mean of remaining nine numbers is 60
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