Suppose That the Probabilities for Intervals of Time Between Successive

Multiple Choice

Suppose that the probabilities for intervals of time between successive occurrences of an event are described by an exponential distribution.The standard deviation of this distribution:

A) is always less than the variance of the distribution
B) is always equal to the expected value of the distribution
C) is always greater than the variance of the distribution
D) is always equal to the variance of the distribution
E) a and b