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

question 12

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.What is the probability that a randomly selected bulb would last less than 1,100 hours?

• A)0.4772
• B)0.9772
• C)0.0228
• D)0.5228
• E)0.5513

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