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Uma copiadora num escritório recebe cerca de 50 papéis por hora, satisfazendo uma distribuição aproximada de \text{Poisson}. O atendimento é feito numa razão de 80 por hora. Calcule o tempo médio entre chegadas na fila.

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57. (UFRGS-RS) Na promoção de um produto cujo custo unitário é de R$ 5,75 se lê: \"Leve 3, pague 2\". Usando as condições da promoção, a economia máxima que poderá ser feita na compra de 188 itens deste produto é:

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