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 La probabilidad y su aplicación 
 En una Unidad de Enfermería hay
 110 enfermeras. De ellas 52
 participan en la investigación I, 36 en
 la investigación II y de estas 52 y 36
 enfermeras respectivamente, 12
 participan en las dos investigaciones.
a) Representar la situación en un diagrama de Venn.
b)Se elige al azar una enfermera. Determinar las probabilidades
  de los siguientes sucesos:
1. Participa en la investigación I.
2. Participa en II.
3. Solo participa en II.
4. Participa, a la vez, en I y II.
5. Participa en I o en II.
6. Participa solo en una investigación.
7. No participa en alguna investigación.
8. No participa en I.
9. Participa en II sabiendo que también participa en I.
10. Participa en I sabiendo que participa en II.
I
        I y II    II
0.363
        0.109    0.218


                               110 enfermeras
                         0.2
   P(I): CF/CP= 52/110=0.473

    2. Participa en II.

   P(II): CF/CP=36/110=0.327


    3. Solo participa en II.
   P(II): CF/CP=24/110= 0.218
   P( I Y II)=P(I∩ II)=12/110=0.11

    5. Participa en I o en II.

   P(I U II)=P(I)+P(II)-P(I∩II)=0.473 +0.327-0.11=0.69

    6. Participa solo en una investigación.

   Primero sumamos los que participan solo en I y solo en II:
    24+40 =64.
   P(participe en 1 inves.): CF/CP=64/110=0.581
   Para averiguar la P de las enfermeras que no
    participe en ninguna investigación, realizamos
    la probabilidad contraria:
   P(contraria)= 1- P(I∪II); 1-0.69=0.31

    8. No participa en I.
Realizamos también la probabilidad contraria:
 P(no I)= 1-P(I)= 1-0.473=0.527
   P(II I I) = CF/CP= P(II ∩ I)/P(I) =
    0.11/0.473=0.235
    10. Participa en I sabiendo que participa
    en II.
   P(I I II):CF/CP=P(I∩II)/P(II)=0.11/0.327=0.336
   Realizado por:
   Mª Angeles Sánchez Rodríguez

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Seminario 7

  • 1.  La probabilidad y su aplicación 
  • 2.  En una Unidad de Enfermería hay 110 enfermeras. De ellas 52 participan en la investigación I, 36 en la investigación II y de estas 52 y 36 enfermeras respectivamente, 12 participan en las dos investigaciones.
  • 3. a) Representar la situación en un diagrama de Venn. b)Se elige al azar una enfermera. Determinar las probabilidades de los siguientes sucesos: 1. Participa en la investigación I. 2. Participa en II. 3. Solo participa en II. 4. Participa, a la vez, en I y II. 5. Participa en I o en II. 6. Participa solo en una investigación. 7. No participa en alguna investigación. 8. No participa en I. 9. Participa en II sabiendo que también participa en I. 10. Participa en I sabiendo que participa en II.
  • 4. I I y II II 0.363 0.109 0.218 110 enfermeras 0.2
  • 5. P(I): CF/CP= 52/110=0.473 2. Participa en II.  P(II): CF/CP=36/110=0.327 3. Solo participa en II.  P(II): CF/CP=24/110= 0.218
  • 6. P( I Y II)=P(I∩ II)=12/110=0.11 5. Participa en I o en II.  P(I U II)=P(I)+P(II)-P(I∩II)=0.473 +0.327-0.11=0.69 6. Participa solo en una investigación.  Primero sumamos los que participan solo en I y solo en II: 24+40 =64.  P(participe en 1 inves.): CF/CP=64/110=0.581
  • 7. Para averiguar la P de las enfermeras que no participe en ninguna investigación, realizamos la probabilidad contraria:  P(contraria)= 1- P(I∪II); 1-0.69=0.31 8. No participa en I. Realizamos también la probabilidad contraria:  P(no I)= 1-P(I)= 1-0.473=0.527
  • 8. P(II I I) = CF/CP= P(II ∩ I)/P(I) = 0.11/0.473=0.235 10. Participa en I sabiendo que participa en II.  P(I I II):CF/CP=P(I∩II)/P(II)=0.11/0.327=0.336
  • 9. Realizado por:  Mª Angeles Sánchez Rodríguez