Question 420655: Having just taken a year of Algebra, Algebra II and College Algebra, my Statistics class is now using Summation, which was never covered in my algebra classes. One question which I do not understand is:
Why is: Sigma x^2 different from (Sigma x^2)? given the following values for x: 1,7,0,8, -6
The answer given me was non parenthesied answer is 150, parenthesied answer is 100.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Why is: Sigma x^2 different from (Sigma x^2)? given the following values for x: 1,7,0,8, -6
The answer given me was non parenthesied answer is 150, parenthesied answer is 100.
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Sigma(x^2) = 1^2 + 7^2 + 0^2 + 8^2 + (-6)^2
= 1 + 49 + 0 + 64 + 36
= 50 + 100
= 150
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[Sigma(x)]^2 = [1 + 7 + 0 + 8 + -6]^2 = 10^2 = 100
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Cheers,
Stan H.
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