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A new extended-life light bulb has an average service life of 768 hours, with a standard deviation of 45 hours. If the service life of

A new extended-life light bulb has an average service life of 768 hours, with a standard deviation of 45 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 617 hours and 917 hours?

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