SOLUTION: A lightbulb company advertises that a 75-watt lightbulb has an average life of 500 hours with a standard deviation of 30 hours. What percent of lightbulbs have an average life bet

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Question 1156728: A lightbulb company advertises that a 75-watt lightbulb has an average life of 500 hours with a standard deviation of 30 hours.
What percent of lightbulbs have an average life between 480 and 525 hours?

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A lightbulb company advertises that a 75-watt lightbulb has an average life of 500 hours with a standard deviation of 30 hours.
What percent of lightbulbs have an average life between 480 and 525 hours?
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No way to know.
The fact that it's advertised doesn't mean it's true.