Question

# Suppose that the longevity of a light bulb is exponential with a...

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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