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a regional telephone company operates three identical relay stations at different locations. during a one-year period, the number of malfunctions reported by each station and the causes are shown below. station a b c problems with electricity supplied 2 1 1 computer malfunction 4 3 2 malfunctioning electrical equipment 5 4 2 caused by other human errors 7 7 5 (a) suppose that a malfunction was reported and it was found to be caused by other human errors. what is the probability that it came from station c ? (b) a malfunction was reported and it was found to be a computer malfunction. what is the probability that it came from station b ?