Assume the Mean Useful Life of a Particular Light Bulb

question 64

Multiple Choice

Assume the mean useful life of a particular light bulb is 2,000 hours and is normally distributed with a standard deviation of 300 hours. Calculate the useful life of the light bulb within two standard deviations of the mean.

• A)Between 1,700 and 2,300 hours
• B)Longer than 2,300 hours
• C)Longer than 1,700 hours
• D)Between 1,400 and 2,600 hours

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