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Suppose that the longevity of a light bulb is exponential with a mean

lifetime of eight years. Find the probability that a light bulb lasts less than one year.
(Round to four decimal places)




Find the probability that a light bulb lasts between six and ten years.
(Round to four decimal places)




Seventy percent of all light bulbs last at least how long?
(Round to four decimal places)
_____years

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