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August 7th, 2017, 04:08 PM  #1 
Member Joined: Apr 2017 From: PA Posts: 45 Thanks: 0  What is the expected time for the first of these bulbs to burn out?
A company buys 100 lightbulbs, each of which has an exponential lifetime of 1000 hours. What is the expected time for the first of these bulbs to burn out? For this, I divided 1000/100 to get 10 hours, is this correct? 
August 7th, 2017, 06:25 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 1,981 Thanks: 1027 
Can you explain why you did this. I believe it is the correct answer but a fair bit of work was needed to show this. Were you given some formula? 

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