QRB 501 Week 3 Exercise 4

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QRB 501 Week 3 Exercise 4 Mean and variance A
dusk-to-dawn outdoor lightbulb has an expected
(mean) life of 8,000 hours with a standard
deviation of 250 hours. How many bulbs in a batch
of 500 can be expected to last no longer than
7,500 hours? To purchase this material click on
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