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Suppose I have the function

[itex]x = a + b -1[/itex]

where a, b have expected values of 0.5 each. What is the expected value of x? is it 0.5 + 0.5 -1 = 0? or is it just 0.5 + 0.5?

Secondly, suppose the same equation as above, [itex]x = a + b -1[/itex]. If the variance of both a and b is 1/12, what is the variance of x?

I know this is really basic but I just dont understand. Thanks guys!

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# Expected value and variance of these sums

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