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Solve plz... 1) ...: A vida media de uma certa marca de lampadas tem uma distribuicao exponencial com media de 1000h. Determinar (mostre os calculos):

Solve plz...

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1) ...: A vida media de uma certa marca de lampadas tem uma distribuicao exponencial com media de 1000h. Determinar (mostre os calculos): a) a porcentagem de lampadas que podem queimar antes das 1000h; b) apos quantas horas terao queimado 5% das lampadas

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