Divina543 Divina543
  • 19-03-2014
  • Mathematics
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What is the average (arithmetic mean) of all the multiples of ten from 10 to 190 inclusive?

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Аноним Аноним
  • 19-03-2014
You've got 19 numbers. Their sum is 10(1+2+3+...+19) or [tex]10*\frac{20*19}{2}[/tex]. Divide that by 19, to get [tex]\frac{10*20}{2}=100[/tex]
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