Essay
Light bulbs are measured in lumens (light output), watts (energy used), and hours (life). A standard white light bulb has a mean life of 675 hours and a standard deviation of 50 hours. A soft white light bulb has a mean life of 700 hours and a standard deviation of 35 hours. At a local science competition, both light bulbs lasted 750 hours. Which light bulb's life span was better? Explain.
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Standard light bulb: 
Soft light bulb:
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Correct Answer:
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Soft light bulb:
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