probability

Consider three lightbulbs each of which has a lifetime that is an independent exponential random variable with parameter λ=1. The variance of the time until all three burn out is:

=

Recall that the variance of an exponential with parameter λ is 1/λ2.

  1. 👍 0
  2. 👎 0
  3. 👁 523
  1. 1/3 ?

    1. 👍 0
    2. 👎 1
  2. 11/6 why it is wrong? could anyone explain this?

    1. 👍 0
    2. 👎 1
  3. 1/9 +1/4 + 1 = 1.361111

    1. 👍 2
    2. 👎 0

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