A New Extended-Life Light Bulb Has an Average Life of 750

question 64

Multiple Choice

A new extended-life light bulb has an average life of 750 hours, with a standard deviation of 50 hours. If the life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours and 900 hours?

• A) 95%
• B) 68%
• C) 34%
• D) 99.47%

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