The Mean Life of a Particular Brand of Light Bulb

question 47

Multiple Choice

The mean life of a particular brand of light bulb is 1200 hours.If you know that at about 95% of this brand of bulbs will last between 1100 and 1300 hours, then what is the standard deviation of the light bulbs' life?

• A)25
• B)50
• C)75
• D)100
• E)200

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Definitions:

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