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Suppose that the longevity of a light bulb is exponential with a mean lifetime of 7.6 years. 85% of all light bulbs last at least

Suppose that the longevity of a light bulb is exponential with a mean lifetime of 7.6 years. 85% of all light bulbs last at least how long?

I'm having issues as the text really doesn't give how to factor in percentiles within Excel.

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