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3. [5 points] Deux variables alatoires discrtes, X et Y, ont la distribution conjointe suivante X 0 1 2 3 1 0,05 0,18 0,13

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3. [5 points] Deux variables alatoires discrtes, X et Y, ont la distribution conjointe suivante X 0 1 2 3 1 0,05 0,18 0,13 0,07 Y 2 0,09 0,14 0,08 0,06 3 0,11 0,03 0,04 0,02 a) Calculer la probabilit que X + Y 3. [1 point] b) Calculer la distribution de probabilit marginale de X. [1 point] c) Calculer la distribution conditionnelle de Y tant donn X = 2. [1 point] d) Calculer la covariance entre X et Y. [2 points]

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