What is standard deviation of the lifetime of a lightbulb

Reference no: EM131370919

Lightbulbs manufactured by a particular company have an exponentially distributed life with mean 100 hours.

a. What is the probability that the lightbulb I am now putting in will last at least 65 hours?

b. What is the standard deviation of the lifetime of a lightbulb?

Reference no: EM131370919

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