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Formula
If average of first n natural numbers = (n+1)/2. Example = ?
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Answer
avg of 1 to 10 = 5.5
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Formula
Weighted Average trick = ?
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If group A has 'a' people with avg P, and group B has 'b' people with avg Q — combined avg = (aP + bQ)/(a+b).
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Formula
If a wrong number was used, correct average = old average + (correct - wrong)/n...?
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If a wrong number was used, correct average = old average + (correct - wrong)/n.
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