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grant.orton
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how do you find the sum of a list of numbers.... ex.... 8,16,....312,320
 one year ago
 one year ago
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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grant.orton Group TitleBest ResponseYou've already chosen the best response.0
I know you have to find the average and multiply with the count or somthing like that
 one year ago

apple_pi Group TitleBest ResponseYou've already chosen the best response.0
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

apple_pi Group TitleBest ResponseYou've already chosen the best response.0
I can explain why this works if you like
 one year ago
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