Asked by Joe DeLucia

Home Depot sells compact fluorescent lamps (CFLs) that have a mean life of 10,000 hours with a standard deviation of 1,000 hours. In an order of 8,000 lamps, how many can be expected to last 11,000 hours or longer?
Answered by Reiny
Perfect for this page ...

http://davidmlane.com/hyperstat/z_table.html
click on above

prob = .1587
multiply that by 8000
Answered by Marc
1587 x 8000 = 12696000
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