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प्रश्न
If r = 0.5, σx = 1 and σy = 4, then find Cov.(X,Y).
बेरीज
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उत्तर
Given, r = 0.5, σ x = 1 and σ y = 4
We have r = `("Cov" ("x" . "y"))/(sigma "x" . sigma "y")`
`=> 0.5 = ("Cov" ("x" . "y"))/(1 xx 4)`
`=> 1/2 = ("Cov" ("x" . "y"))/4`
⇒ Cov . (x , y) = `4/2 = 2`
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