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Reliability question with exponential distribution

  1. May 15, 2009 #1
    Q. A certain type of memory chip is known to have an exponential life distribution with a failure rate of 0.15*10^-5.

    a) What is the probability that a memory chip will survine 20,000 hours of use?

    b) What is the probability it will fail in the next 35,000 hours if it has survived 20,000 hours of operation already??

    c) By what time 10% of the chips , 50% of the chips, 63.2% of the chips be expected to fail??

    I was wondering if somebody could help me with b OR c???? Much appreciated. Please give some explanation , if possible, so easy for me to understand...

    thanks.
     
  2. jcsd
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