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The service life (in hours) of an electronic device shows from experience that the unit fails...

The service life (in hours) of an electronic device shows from experience that the unit fails an average of 500 hours of use. A) What is the probability that the device will operate 100 or more hours before failing? B) If the device has already worked for at least 300 hours, what is the probability that it will last at least 400 more?
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