In: Statistics and Probability
" time headway" in traffic flow is the elapsed time between the time that one car finishes passing a fixed point and the instant that the next car begins to pass that point. Let X=the time headway for two randomly chosen consecutive cars on a freeway during a period of heavy flow. Suppose that in a different traffic environment, the distribution of time headway has the form
f(x)={k/x^5, x>=2
{0, x<2.
a) Determine the value of k for which f(x) is a reasonable pdf.
b) obtain the cumulative distribution function.
c) Determine the probability that headway exceeds 5 sec.
d) Find the expected value and the standard deviation of headway