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2

3 puntos
En una universidad el alumnado puede cursar una asignatura optativa o bien en modalidad presencial o bien en modalidad virtual. Se sabe que: - El 60 %60\,\% del alumnado elige la modalidad presencial. - Entre quienes eligen modalidad virtual, el 20 %20\,\% aprueba la asignatura. - Entre quienes eligen modalidad presencial, el 35 %35\,\% aprueba la asignatura. Se elige al azar un estudiante de la asignatura.
a
Calcula la probabilidad de que el estudiante seleccionado apruebe la asignatura.1 pt
b
Sabiendo que el estudiante ha aprobado, calcula la probabilidad de que haya cursado la asignatura en modalidad presencial.1 pt
c
¿Es más probable que un estudiante que ha aprobado haya cursado la asignatura en modalidad presencial o virtual? Justifica la respuesta.1 pt

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Áreas limitadas por la curva N(0,1)N(0, 1) desde −∞-\infty hasta zz
Áreas limitadas por la curva normal Curva N(0,1) con el área sombreada desde menos infinito hasta z, situado a la derecha del centro. z
0,000,010,020,030,040,050,060,070,080,09
0,00,50000,50400,50800,51200,51600,51990,52390,52790,53190,5359
0,10,53980,54380,54780,55170,55570,55960,56360,56750,57140,5753
0,20,57930,58320,58710,59100,59480,59870,60260,60640,61030,6141
0,30,61790,62170,62550,62930,63310,63680,64060,64430,64800,6517
0,40,65540,65910,66280,66640,67000,67360,67720,68080,68440,6879
0,50,69150,69500,69850,70190,70540,70880,71230,71570,71900,7224
0,60,72570,72910,73240,73570,73890,74220,74540,74860,75170,7549
0,70,75800,76110,76420,76730,77040,77340,77640,77940,78230,7852
0,80,78810,79100,79390,79670,79950,80230,80510,80780,81060,8133
0,90,81590,81860,82120,82380,82640,82890,83150,83400,83650,8389
1,00,84130,84380,84610,84850,85080,85310,85540,85770,85990,8621
1,10,86430,86650,86860,87080,87290,87490,87700,87900,88100,8830
1,20,88490,88690,88880,89070,89250,89440,89620,89800,89970,9015
1,30,90320,90490,90660,90820,90990,91150,91310,91470,91620,9177
1,40,91920,92070,92220,92360,92510,92650,92790,92920,93060,9319
1,50,93320,93450,93570,93700,93820,93940,94060,94180,94290,9441
1,60,94520,94630,94740,94840,94950,95050,95150,95250,95350,9545
1,70,95540,95640,95730,95820,95910,95990,96080,96160,96250,9633
1,80,96410,96490,96560,96640,96710,96780,96860,96930,96990,9706
1,90,97130,97190,97260,97320,97380,97440,97500,97560,97610,9767
2,00,97720,97780,97830,97880,97930,97980,98030,98080,98120,9817
2,10,98210,98260,98300,98340,98380,98420,98460,98500,98540,9857
2,20,98610,98640,98680,98710,98750,98780,98810,98840,98870,9890
2,30,98930,98960,98980,99010,99040,99060,99090,99110,99130,9916
2,40,99180,99200,99220,99250,99270,99290,99310,99320,99340,9936
2,50,99380,99400,99410,99430,99450,99460,99480,99490,99510,9952
2,60,99530,99550,99560,99570,99590,99600,99610,99620,99630,9964
2,70,99650,99660,99670,99680,99690,99700,99710,99720,99730,9974
2,80,99740,99750,99760,99770,99770,99780,99790,99790,99800,9981
2,90,99810,99820,99820,99830,99840,99840,99850,99850,99860,9986
3,00,99870,99870,99870,99880,99880,99890,99890,99890,99900,9990
3,10,99900,99910,99910,99910,99920,99920,99920,99920,99930,9993
3,20,99930,99930,99940,99940,99940,99940,99940,99950,99950,9995
3,30,99950,99950,99950,99960,99960,99960,99960,99960,99960,9997
3,40,99970,99970,99970,99970,99970,99970,99970,99970,99970,9998
3,50,99980,99980,99980,99980,99980,99980,99980,99980,99980,9998
3,60,99980,99980,99990,99990,99990,99990,99990,99990,99990,9999
3,70,99990,99990,99990,99990,99990,99990,99990,99990,99990,9999
3,80,99990,99990,99990,99990,99990,99990,99990,99990,99990,9999
3,91,00001,00001,00001,00001,00001,00001,00001,00001,00001,0000