The mean or average of the numbers -410 and 400 is -5. It is found by adding the two numbers together and dividing the sum by two.
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The count of the numbers is 410+1+400 = 811. To get the sum of all these numbers note that all the positive numbers cancel with their negative counterparts and you are left only with the numbers from -410 to -401 (inclusive). The sum of these numbers is -4055. So their mean is Sum/Count = -4055/811 = -5.
410
410
I guess you mean what numbers divide 410 [exactly], ie what are the factors of 410. The factors of 410 are: 1, 2, 5, 10, 41, 82, 205, 410
390, 400