Bulb life
Tests show that the lives of light bulbs are normally distributed with a mean of 750 hours and a standard deviation of 75 hours. Find the probability that a randomly selected light bulb will last between 675 and 900 hours.
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You need to know the following knowledge to solve this word math problem:
statisticscombinatoricsarithmeticUnits of physical quantitiesGrade of the word problem
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