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Posts: 240
2 weeks ago
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. In a test at a local science competition, both light bulbs lasted 750 hours. Which light bulb's life span was better? Explain.
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Stats: Modeling the World


Edition: 4th
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Posts: 225
2 weeks ago
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Standard light bulb: z = = 1.5   Soft light bulb: z = = 1.4286
The standard light bulb lasted more than 1.5 standard deviations above its mean life, compared to the soft light bulb at 1.4286 standard deviations above its mean. The standard light bulb's performance was slightly better.
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