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Qual a probabilidade de exatamente três desses alunos terem sido reprovados?

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Questionário

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Consulta a anuários e revistas

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Entrevistas por telefone

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Entrevistas pessoais

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Observação

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Há diversos métodos para coletar dados primários citados, abaixo, exceto:

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A série estatística representada é:

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Comentários