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A1

2 puntos
Apartado A
Una fábrica de tomate elabora y envasa distintos tipos de tomate. En el proceso de elaboración, el 20%20\% corresponde a tomate triturado, el 70%70\% a tomate frito, y el resto a mermelada de tomate. Del total de tomate triturado procesado, el 3%3\% se rechaza por contener impurezas. Lo mismo ocurre con el 7%7\% del tomate frito y con el 2%2\% de la mermelada. Se pide:
a
Calcular la probabilidad de que, elegido un producto al azar, resulte ser de los que se ha rechazado por contener impurezas.1 pt
b
Sabiendo que el producto elegido no ha sido rechazado, calcular la probabilidad de que ese producto sea mermelada.1 pt

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ANEXO TABLA DISTRIBUCIÓN NORMAL Tabla de distribución normal N(0,1)N(0, 1) F(z)=P(Z≤z)F(z) = P(Z \leq z)
Área acumulada de la distribución normal tipificada Campana simétrica respecto a cero. El área F(z) se extiende desde menos infinito hasta z, situado a la derecha de cero. F(z) 0 z −∞ +∞
zz0,000,010,02
0,00,50000,50400,5080
0,10,53980,54380,5478
0,20,57930,58320,5871
0,30,61790,62170,6255
0,40,65540,65910,6628
0,50,69150,69500,6985
0,60,72570,72910,7324
0,70,75800,76110,7642
0,80,78810,79100,7939
0,90,81590,81860,8212
1,00,84130,84380,8461
1,10,86430,86650,8686
1,20,88490,88690,8888
1,30,90320,90490,9066
1,40,91920,92070,9222
1,50,93320,93450,9357
1,60,94520,94630,9474
1,70,95540,95640,9573
1,80,96410,96490,9656
1,90,97130,97190,9726
2,00,97720,97780,9783
2,10,98210,98260,9830
2,20,98610,98640,9868
2,30,98930,98960,9898
2,40,99180,99200,9922
2,50,99380,99400,9941
2,60,99530,99550,9956
2,70,99650,99660,9967
2,80,99740,99750,9976
2,90,99810,99820,9982
3,00,99870,99870,9987
3,10,99900,99910,9991
3,20,99930,99930,9994
3,30,99950,99950,9995
3,40,99970,99970,9997
3,50,99980,99980,9998
3,60,99980,99980,9999
3,70,99990,99990,9999
3,80,99990,99990,9999
3,91,00001,00001,0000
zz0,030,040,05
0,00,51200,51600,5199
0,10,55170,55570,5596
0,20,59100,59480,5987
0,30,62930,63310,6368
0,40,66640,67000,6736
0,50,70190,70540,7088
0,60,73570,73890,7422
0,70,76730,77040,7734
0,80,79670,79950,8023
0,90,82380,82640,8289
1,00,84850,85080,8531
1,10,87080,87290,8749
1,20,89070,89250,8944
1,30,90820,90990,9115
1,40,92360,92510,9265
1,50,93700,93820,9394
1,60,94840,94950,9505
1,70,95820,95910,9599
1,80,96640,96710,9678
1,90,97320,97380,9744
2,00,97880,97930,9798
2,10,98340,98380,9842
2,20,98710,98750,9878
2,30,99010,99040,9906
2,40,99250,99270,9929
2,50,99430,99450,9946
2,60,99570,99590,9960
2,70,99680,99690,9970
2,80,99770,99770,9978
2,90,99830,99840,9984
3,00,99880,99880,9989
3,10,99910,99920,9992
3,20,99940,99940,9994
3,30,99960,99960,9996
3,40,99970,99970,9997
3,50,99980,99980,9998
3,60,99990,99990,9999
3,70,99990,99990,9999
3,80,99990,99990,9999
3,91,00001,00001,0000
zz0,060,070,08
0,00,52390,52790,5319
0,10,56360,56750,5714
0,20,60260,60640,6103
0,30,64060,64430,6480
0,40,67720,68080,6844
0,50,71230,71570,7190
0,60,74540,74860,7517
0,70,77640,77940,7823
0,80,80510,80780,8106
0,90,83150,83400,8365
1,00,85540,85770,8599
1,10,87700,87900,8810
1,20,89620,89800,8997
1,30,91310,91470,9162
1,40,92790,92920,9306
1,50,94060,94180,9429
1,60,95150,95250,9535
1,70,96080,96160,9625
1,80,96860,96930,9699
1,90,97500,97560,9761
2,00,98030,98080,9812
2,10,98460,98500,9854
2,20,98810,98840,9887
2,30,99090,99110,9913
2,40,99310,99320,9934
2,50,99480,99490,9951
2,60,99610,99620,9963
2,70,99710,99720,9973
2,80,99790,99790,9980
2,90,99850,99850,9986
3,00,99890,99890,9990
3,10,99920,99920,9993
3,20,99940,99950,9995
3,30,99960,99960,9996
3,40,99970,99970,9997
3,50,99980,99980,9998
3,60,99990,99990,9999
3,70,99990,99990,9999
3,80,99990,99990,9999
3,91,00001,00001,0000
zz0,09
0,00,5359
0,10,5753
0,20,6141
0,30,6517
0,40,6879
0,50,7224
0,60,7549
0,70,7852
0,80,8133
0,90,8389
1,00,8621
1,10,8830
1,20,9015
1,30,9177
1,40,9319
1,50,9441
1,60,9545
1,70,9633
1,80,9706
1,90,9767
2,00,9817
2,10,9857
2,20,9890
2,30,9916
2,40,9936
2,50,9952
2,60,9964
2,70,9974
2,80,9981
2,90,9986
3,00,9990
3,10,9993
3,20,9995
3,30,9997
3,40,9998
3,50,9998
3,60,9999
3,70,9999
3,80,9999
3,91,0000