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On suppose que la loi de U est donnée par le tableau suivant :
Calculez E(U) et V(U).
E(U) = 3,75 ; V(U) = 0,93
E(U) = 0,93 ; V(U) = 1,86
E(U) = 3,75 ; V(U) = 0,87
E(U) = 0,87 ; V(U) = 0,93
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