Mathematics, 22.04.2020 04:09, noahmoritz2004

The lifetime of a battery has the exponential distribution with mean 6.9 months. If it fails, I immediately replace it with another – if I have one. I need a year’s supply of the battery. In addition to the one in the flashlight, how many extra should I bring with me? 1, 2, or 3?

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The lifetime of a battery has the exponential distribution with mean 6.9 months. If it fails, I imme...