Question 876192: An engineer thinks that the best model for time between breakdowns
of a generator is the exponential distribution with a mean of 15 days.
(a) If the generator has just broken down, what is the probability that it
will break down in the next 21 days?
(b) What is the probability that the generator will operate for 30 days
without a breakdown?
(c) If the generator has been operating for the last 20 days, what is the
probability that it will operate for another 30 days without a
breakdown?
(d) Comment on the results of parts (b) and (c).
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! Average Time between breakdowns of a generator = 15days
a) P = poissonpdf(15,21)= .02986
b) P = poissonpdf(15,30)= .0002
c. P = poissonpdf(15,50)= 6.4x10^(-13)
d) Better Chance of operating 30days, after a breakdown than w/0
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