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1.The average of 9 numbers in a list is 6. What is the sum of these 9 numbers?

2.Then the number 26 is added to the list. What is the average of the 10 numbers in the new list?

User Evan Anger
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1 Answer

5 votes

(1) average = sum / 9

6 = sum / 9

sum = 6*9 = 54

(2) new average = (sum + 26)/10 = (54+26)/10 = 8

new average is 8

User Fiacobelli
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