How to simplify this expression? (statistics)

hi!

I want to find a simplified solution for the attached expression, I tried several times, but each time my solution changed. 

X(bar)= sum(x(i)) (idem Y(bar))

Thanks in advance!

Statistics
Cc 2213 Cc 2213
8
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  • Daniel90 Daniel90
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Fiuzeri Fiuzeri
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