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Mathematics 13 Online
OpenStudy (anonymous):

A certain type of light bulb has an average life of 500 hours, with a standard deviation of 100 hours. The length of life of the bulb can be closely approximated by a normal curve. An amusement park buys and installs 10000 such bulbs. Find the total number that can be expected to last for each period of time. More than 440 hours

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