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A washing machine of a certain brand has an average life of 10 years. The lifespan of your type of motor can be thought of
A washing machine of a certain brand has an average life of 10 years. The lifespan of your type of motor can be thought of as an exponentially distributed random variable X,What should be the warranty time that such washing machines must have, if you want them not to be?More than 20% of these fail before their warranty expires.
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