17.4 Probability. Probability of a specific outcome of a random phenomenon is
(a) the number of times it occurs in very many repetitions of the phenomenon.
(b) the number repetitions of the phenomenon it takes for the outcome to first occur.
(c) the proportion of times it occurs in very many repetitions of the phenomenon.
(d) the ratio of the number of times it occurs to the number of times it does not occur in very many repetitions of the phenomenon.