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Continuous - 1 hours a b %oftheb

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Problems for Reliability in Engineering Based on Continuous Distributions 1. The lifetime of all Everglo bulbs is normally distributed with mean 400 hours and standard deviation 50  hours.   a.  What percentage of the bulbs will burn out in less than 360 hours? b. After how many hours will 80% of the bulbs burn out? 2. High-Tech Inc., produces an electronic component, GX-7, that has an average life span of 4500 hours.  The lifespan is normally distributed with a standard deviation of 500 hours. The company is considering  a 3800 hour warranty on the GX-7.  If this warranty policy is adopted, what proportion of GX-7  components should High-Tech expect to replace under warranty? 3. The inside diameter of a manufactured cylinder is believed to follow a normal distribution centered on  5.00 inches with a standard deviation of .03 inches.  The diameter of the cylinder must be within 4.95  inches (the lower spec limit) and the 5.07 inches (the upper spec limit).  If the diameter is outside of 
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