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August 7th, 2017, 04:08 PM   #1
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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?
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August 7th, 2017, 06:25 PM   #2
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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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