find the average: x+y
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Formula for average is sum of observations/number of observations.
So average of x+y = (x+y)/2
So average of x+y = (x+y)/2
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When you're asked for x+y, is it safe to assume that you need either x and y individually, or the value of x+y combined to achieve sufficiency? Will things like x+2y, 3x+4y, etc. always be insufficient? Whenever I'm faced with these problems, I find myself spending time trying to manipulate the x+2y into x+y, so it would be nice to know if I could just quickly say insufficient and move on.
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