Let Z be the discrete random variable of the number of breakdown for some system
per year. Suppose that during the 3-year period, the probability of two breakdowns is
half the value in comparison with the probability of three breakdowns.
(1) Find the mean time of breakdown for such a system.
(2) Find the probability that at least two breakdowns occur in the second half of this
year, from Jul. 1 to Dec. 31.
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