Light Bulbs Are Measured in Lumens (Light Output), Watts (Energy

question 128

Multiple Choice

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?

• A)The soft white light bulb because it is 7% beyond the mean.
• B)The standard white light bulb because it is 75 hours beyond the mean.
• C)The standard white light bulb because it is 11% beyond the mean.
• D)The standard light bulb because it lasted 1.5 standard deviations above the mean life.
• E)The soft white light bulb because it is 50 hours beyond the mean.

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