A new extended-life light bulb has an average service life

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A new extended-life light bulb has an average service life of 770 hours, with a standard deviation of 51 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 524 hours and 824 hours?

76.968%

42.76%

14.48%

85.52%

Reference no: EM13643923

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