If $\ \sum_{}^{}x = 15,\ \sum_{}^{}y = 36,\ \sum_{}^{}{xy} = 110,\ n = 5$, then $cov(x,y)$ equals

Question

Dr. Abubacker · Accepted Answer

(c)
Cov$(x,y) = \frac{1}{n}\Sigma xy - \overline{x}\overline{y}$
$= \frac{1}{2}(110) - \left( \frac{15}{5} \right)\left( \frac{36}{5} \right)$=$\frac{2}{5}$

Q. If $\ \sum_{}^{}x = 15,\ \sum_{}^{}y = 36,\ \sum_{}^{}{xy} = 110,\ n = 5$, then $cov(x,y)$ equals

Explanation

Reviewed by Dr. Abubacker

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