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A junction box for the International space station is assumed to have a constant hazard rate...

A junction box for the International space station is assumed to have a constant hazard rate of 0.025 failures per year. Should a junction box fail, it can be replaced with a spare junction box with identical reliability characteristics.

How many spare junction boxes are need to ensure that there is at least a 98 per cent probability of a functional junction box at the end of a six month mission?

Math   Statistics-And-Probability   
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