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2. Suppose I have a flashlight which requires one battery to operate, and I have 18 identical batteries. I want to go camping for


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2. Suppose I have a flashlight which requires one battery to operate, and I have 18 identical batteries. I want to go camping for a week (247 = 168) hours. If the lifetime of a single battery follows a distribution Exp(0.1) whose expectation is 10 and variance is 100, what's the probability my flashlight can operate for the entire 168 hours of my trip?

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