The Average Life of a Light Bulb Is 862 Hours

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The average life of a light bulb is 862 hours with a standard deviation of 51 hours. A new manufacturing process results in a sample of 24 bulbs with a mean life of 899 hours until burn out. The average life of a light bulb is 862 hours with a standard deviation of 51 hours. A new manufacturing process results in a sample of 24 bulbs with a mean life of 899 hours until burn out.

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