Find a probability of a random chosen light bulb will last, Mathematics

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Find a probability of a random chosen light bulb will last

The better light bulb has an average life of 600 hours with a standard deviation of 40 hours. The length of the bulb can be closely approximated by a normal curve. Find a probability of a random chosen light bulb will last at least 685 hours. Round your answer to three decimal places.

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Mathematics: Find a probability of a random chosen light bulb will last

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