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 probability that there are less than 3 occurrences is
a. .0659
b. .0948
c. .1016
d. .1239
c
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