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 Topic: failure rate
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 Probability tree - two switches failing 2007-06-05 From Maura:draw a probability to show the outcomes of two new switches (a) of both switches being faulty (b)both switches are not faulty (c) that one switch is faulty. The failure rate is 1/10.Answered by Stephen La Rocque. The bathtub curve 2005-10-13 From David:My father asked me to submit a question about the so-called 'bathtub curve'. If you cut a bathtub in half lengthwise down it's middle, the edge of the tub would describe the 'bathtub curve' which can be used to demonstrate typical failure rates of products. This curve is characterised by high initial (infant mortality) failure rates at it's beginning, which drop quickly to a very low level. Failures then increase gradually to the "end of life" stage where the failure rate takes off dramatically again. If anyone in the math department knows about the so-called 'bathtub curve' my father would really appreciate the equation. Answered by Chris Fisher and Edward Doolittle.

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