SOLUTION: The mean of 8 numbers is 11. If an 9th number is now included in the results, the mean becomes 10. What is the value of the 9th number? Produce an algebraic solution.

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: The mean of 8 numbers is 11. If an 9th number is now included in the results, the mean becomes 10. What is the value of the 9th number? Produce an algebraic solution.       Log On

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Question 472130: The mean of 8 numbers is 11. If an 9th number is now included in the results, the mean becomes 10. What is the value of the 9th number? Produce an algebraic solution.
Answer by edjones(7569) About Me  (Show Source):
You can put this solution on YOUR website!
8*11=88
(88+x)/9=10
88+x=90
x=2
.
Ed