Question

A long-life flood lamp has a lifetime that is normally distributed with a mean of 10,000 hours and a standard deviation of 2,525 hours.
a. What percentage of the flood lamps would last for more than 12,000 hours?
b. What lifetime should the manufacturer advertise for these lamps so that only 2% will burn out before the advertised lifetime?


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  • CreatedJuly 12, 2015
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