The Expected (Mean)life of a Particular Type of Light Bulb

question 1

Multiple Choice

The expected (mean) life of a particular type of light bulb is 1,000 hours with a standard deviation of 50 hours.The life of this bulb is normally distributed.Which most closely reflects the probability that a randomly selected bulb would last longer than 1150 hours?

• A)0.4987
• B)0.9987
• C)0.0013
• D)0.5013
• E)0.5513

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