Question

find the answer please

Answer 1

so average is$\frac{sum(x)}{n} = 7$
$sum((x-9)^2) = 82 \\ sum(x^2-18x+81) = 82 \\ sum(x^2)-18sum(x)+sum(81)=82 \\ sum(x^2) = 82 - 81*5+18(35) = 307$
now for
[tex]sum((x - 7)^2) = sum(x^2-14x+49) = sum(x^2)-14sum(x)+49*5 \\ = 307 - 14(35) + 49(5) = 62[/tex]