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A certain type of light bulb has an average life of 400 hours, with a standard deviation of 75 hours. The length of the life

A certain type of light bulb has an average life of 400 hours, with a standard deviation of 75 hours. The length of the life of the bulb can be closely approximated by a normal curve. An amusement park buys and installs 1000 such bulbs. Find the total number that can be expected to last for less than 600 hours.

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