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grant.orton Group Title

how do you find the sum of a list of numbers.... ex.... 8,16,....312,320

  • one year ago
  • one year ago

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  1. grant.orton Group Title
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    I know you have to find the average and multiply with the count or somthing like that

    • one year ago
  2. apple_pi Group Title
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    This is an ARITHMETIC series: It goes up by a constant number. To sum this, first figure out how many terms there are in the series. Let the terms be denoted as such: T1 = 8 T2 = 16 ... Tn = 8n. So if Tn = 320 = 8n then n = 40. Therefore you have 40 terms. Now to sum the series you multiply the number of terms by the average of the first and last terms. Then divide by 2. \[\frac{40(8+320)}2=6560\]

    • one year ago
  3. apple_pi Group Title
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    I can explain why this works if you like

    • one year ago
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