P poopeyey2 Apr 2017 45 0 PA Aug 7, 2017 #1 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?

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?

romsek Math Team Sep 2015 2,762 1,540 USA Aug 7, 2017 #2 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?

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?