3 years ago

What is the average (arithmetic mean) of all the multiples of ten from 10 to 190 inclusive?

1 answer:

5 0

You've got 19 numbers. Their sum is 10(1+2+3+...+19) or $10*\frac{20*19}{2}$ . Divide that by 19, to get $\frac{10*20}{2}=100$

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