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Probability question in Calculus A lightbulb lasts on average 5 years. a. (8 points) What is the probability that the bulb lasts less than 2

Probability question in Calculus

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A lightbulb lasts on average 5 years. a. (8 points) What is the probability that the bulb lasts less than 2 years or more than 7 years? b. (8 points) After one bulb fails, I replace it with a new one. What is the probability that I will do this exactly twice in 10 years

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