Question: What is the probability that the LOS for the freeway segment = D because of unpredictable nature of traffic? Assume that the peak hour demand

What is the probability that the LOS for the freeway segment
=D because of unpredictable nature of traffic? Assume that the peak hour demand flow rate is
normal distributed with mean 3500vehh and standard deviation 250vehh, and the adjusted peak
demand flow rate at the boundary between LOS =C and D is 1800pch?lane. The Z-scores are
available on the next page.
What is the probability that the LOS for the

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