Uma urna tem 20 bolas pretas e 30 brancas. Retiram-se 25 bolas com reposição. Qual a probabilidade de que: a) 2 sejam pretas? R:0,00038 b) Pelo men...

Para calcular a probabilidade de que pelo menos 3 bolas sejam pretas, podemos calcular a probabilidade de que 0, 1 ou 2 bolas sejam pretas e subtrair esse valor de 1, já que a soma de todas as probabilidades possíveis é igual a 1. Probabilidade de que 0 bolas sejam pretas: P(0 pretas) = (30/50)^25 = 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