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Math for Educators

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Find the sum of the sequence.
38+39+40+41+...+137

The sum is?

My answer 175(99)= 17,325

Is this correct? If not how do I get the correct answer?

  • Math for Educators -

    no, no.

    first: there are 100 terms here.
    second, how did you get 175 as the mean? 175 is greater than the highest term? The mean is 175/2

    the mean is 137+38 divided by 2

    one hundred terms x mean=below


    sum= 100(38+137)/2=175*50=8750

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