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Earn +20 ptsQ: What is the sum of 1 2 3 4...76?
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What is the sum of -3 4 -2?
-3 + 4 + (-2) = 1 + (-2) = 1 - 2 = -1.
What is the sum of 2 and 1?
3
Mixed numbers with sum of 3?
1 1/2 + 1 1/2 = 3
What is the average deviation to numbers 6 1 4 3 4 1 2 9 5?
Standard deviation = sqrt(variance) Variance = E[X2] - E[X]2 E[X] = sum(X)/n = 35/9, so E[X]2 = 1225/81 E[X2] = sum(X2)/n = 189/9 = 1701/81 Variance = 476/81 Standard deviation = sqrt(476/81) ~ 2.42
What is pair of numbers whose sum is 3 and whose difference is 1?
2 and 1 .their sum is 3 .difference is 1
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