The random variable x is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. It is known that the mean number of occurrences in ten minutes is 5.3 . The appropriate probability distribution for the random variable is

a. discrete.
b. continuous.
c. either discrete or continuous depending on how the interval is defined.
d. binomial.


a

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