Probabilidades Marginales

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Probabilidades Marginales

  1. 1. Encontrar las Probabilidades  Marginales
  2. 2. Tenemos que: x= 1, 2, 3  e  y= 1, 2, 3 En este caso la probabilidad marginal de x es:  Px ( x ) = ∑ P ( x, y ); ∀y Px (1) = 0.10 + 0.10 + 0.05 = 0.25 Px (2) = 0.05 + 0.20 + 0.15 = 0.40 Px (3) = 0.05 + 0.10 + 0.20 = 0.35
  3. 3. Y la probabilidad marginal de y es:  Py ( y ) = ∑ P ( x, y ); ∀x Py (1) = 0.10 + 0.05 + 0.05 = 0.20 Py (2) = 0.10 + 0.20 + 0.10 = 0.40 Py (3) = 0.05 + 0.15 + 0.20 = 0.40 En resumen:
  4. 4. Tenemos la siguiente Tabla: y pelusa x invierno 1 2 3 P y (y) 1 0.10 0.05 0.05 0.20 2 0.10 0.20 0.10 0.40 3 0.05 0.15 0.20 0.40 P x (x) 0.25 0.40 0.35 1.00

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