
Advanced Statistics Advanced Probability and Statistics Math Forum 
 LinkBack  Thread Tools  Display Modes 
August 7th, 2017, 05:08 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, 07:25 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 1,652 Thanks: 838 
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? 

Tags 
bulbs, burn, expected, time 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Calculating expected time  calypso  Probability and Statistics  3  April 24th, 2017 11:28 AM 
Expected time from Poisson process  Artemis  Advanced Statistics  1  November 11th, 2009 08:08 PM 