Question: In a certain study, it is found that the life of a light bulb is exponentially distributed with a mean life of 1,200 hours. (a)

  1. In a certain study, it is found that the life of a light bulb is exponentially distributed with a mean life of 1,200 hours. 
  2. (a) What is the probability that a randomly selected bulb will last more than 1,400 hours? 
  3. (b) What is the probability that the bulb will last less than 1,000 hours? 
  4. (c) What is the median life of a bulb?

  6.  

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