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The mean of 10 numbers is 8. If an 11 th number is now included in the results, the mean becomes 9. What is the
The mean of 10 numbers is 8. If an 11th number is now included in the results, the mean becomes 9. What is the value of the 11th number? Produce an algebraic solution. Guess and check is unacceptable.
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Authors: Steven K Thompson
3rd Edition
111816296X, 9781118162965
