Question: A design engineer at Edison Electric wanted to collect data on the service life of a halogen light bulb his company produces. He observed 10,000

A design engineer at Edison Electric wanted to collect data on the service life of a halogen light bulb his company produces. He observed 10,000 bulbs and found out that the service life is normally distributed with a mean of 420 hours and a standard deviation of 45 hours. FE considers the service life of a bulb between 330 and 510 hours acceptable. What should be Edisons process variability (in terms of standard deviation) to increase the percentage of acceptable light bulbs to 99.7%? (Enter your response rounded to two decimal places.)

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