(c) Use the cdf from (b) to determine the probability that headway exceeds 2 sec. (Round your answer to four decimal places.) 0.00048 0.0005 Use the cdf from (b) to determine the probability that headway is between 2 and 3 sec. (Round your answer to four decimal places.) 0.0002 x 0.0005 (d) Obtain the mean value of headway and the standard deviation of headway. (Round your standard deviation to three decimal places.) 1.2 X 1.1 mean standard deviation 0.539 X 0.111 (e) What is the probability that headway is within 1 standard deviation of the mean value? (Round your answer to three decimal places.) 896.4426 X 0.878