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7.11111111 (repeating) Simply add up all of the terms, and then divide by the number of terms. in this case, the sum of the terms is 64, and the number of terms is 9. 64/9 = 7.1111
YES!!!! From the Latin for '10' ; DECA....
it means the average. add up all of the numbers and divide by the number of numbers you added. for example, 10+ 10+10=30 the mean is 30 divided by 3 = 10 the average! A nasty average?
The mean of the given numbers is their sum divided by the number of terms.~6.857 or 6 6/7
A decade is 10 years therefore 8 decades is 80 years.