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A product has a mean life of 65 weeks and a standard deviation of 25 weeks. A design engineer assured that a 99.3 probability

A product has a mean life of 65 weeks and a standard deviation of 25 weeks. A design engineer assured that a 99.3 probability of failure exceeds 1.6 standard deviations from product's expected life. Given 1.6 standard deviations exceeding mean life, what is the duration of use a customer should expect in weeks (product use is normally distributed)?

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