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Sagot :

TOMMUS

Réponse :

[tex]\sigma(X) = \sqrt{Var(X)} \\\sigma(X) = \sqrt{0,39(6-10,73)^2+0,15(13-10,73)^2+0,46(14-10,73)^2} \\\sigma(X) = \sqrt{14,4171} \\\sigma(X) \approx 3,80[/tex]

Et voilà !

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