A) \[-2\]
B) 2
C) 22
D) None of these
Correct Answer: A
Solution :
Given, \[\Sigma x=15,\text{ }\Sigma y=40,\text{ }\Sigma xy=110,\text{ }n=5\] \[\overline{X}=\frac{1}{n}\Sigma x=\frac{1}{5}\times 15=3\] \[\overline{Y}=\frac{1}{n}\Sigma y\] \[=\frac{1}{5}\times 40=8\] \[\operatorname{cov}(x,y)=\frac{1}{n}\Sigma xy-\overline{X}\overline{Y}\] \[=\frac{1}{5}\times 110-3\times 8\] \[=22-24=-2\]
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