Resolve os seguintes problemas de probabilidade
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Nun grupo de 50 estudantes, a 30 gústanlle as matemáticas, a 20 física e a 10 gústanlle ambas. Se se escolle un estudante ao chou, cal é a probabilidade de que lle guste ou matemáticas ou física?
Se a probabilidade de que chova mañá é de 0.5 e, se chove, a probabilidade de que o teu equipo de fútbol gañe é de 0.8, cal é a probabilidade de que chova e o teu equipo gañe?
Hai dous camiños para chegar ao traballo, A e B. O camiño A está libre de tráfico o 70% das veces, mentres que o camiño B está libre o 60% das veces. Se escoller un camiño ao azar cada día, cal é a probabilidade de que non atopes tráfico?
Nunha fábrica, hai dúas máquinas, A e B, que producen o 30% e o 70% dun produto, respectivamente. A máquina A ten unha taxa de defectuosos do 1%, mentres que a máquina B ten unha taxa do 2%. Se se selecciona un produto ao chou e este resulta defectuoso, cal é a probabilidade de que fose producido pola máquina A?
Cal é a probabilidade de obter un número maior que 4 ao lanzar un dado de seis caras?
Se lanzas dous dados, cal é a probabilidade de obter unha suma de 8?
Se lanzas dúas moedas, cal é a probabilidade de que ambas sexan caras se sabes que a primeira foi cara?
Nuna festa de 60 persoas, 35 teñen gafas, 25 teñen pelo rubio e 15 teñen ambos. Se escollésemos unha persoa ao azar, cal é a probabilidade de que teña gafas ou pelo rubio?
Nun colexio hai dúas clases de matemáticas, A e B. Na clase A hai 20 estudantes e na B hai 30. Seleccionamos un estudante ao azar e vemos que aprobou matemáticas. Sabendo que na clase A aprobou o 80% dos estudantes e na B o 70%, cal é a probabilidade de que o estudante seleccionado pertenza á clase A?
Nunha aldea, hai dous fontaneiros, Ana e Bruno. Ana soluciona o 70% das incidencias, e Bruno o resto. O 5% das incidencias solucionadas por Ana precisan unha segunda visita, mentres que as de Bruno precisan unha segunda visita nun 10% dos casos. Cal é a probabilidade de que unha incidencia solucionada non necesite unha segunda visita?
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