What is the probability that the lightbulb i am now putting


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?

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Basic Statistics: What is the probability that the lightbulb i am now putting
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