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11-11-2018
Mathematics

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Complete the list of five different integers so that they have a mean of −10. Explain how you found your answer. −10, 0, , −5, −15

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11-11-2018

If five numbers have a mean of -10 it means they'll have a sum of 5(-10) = -50.

That's because the mean is the sum divided by the count, so the sum is the mean times the count.

Here our sum is -10 + 0 + -5 + -15 = -30, so our fifth number must be -50 - -30 = -20 to make the sum -50 and the mean -10.

Answer: -20

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