If Light Bulbs Have Lives That Are Normally Distributed with a Mean

question 22

Multiple Choice

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?

• A) About 25%
• B) About 50%
• C) About 75%
• D) About 68%

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