(Answered): 1. Results of a spot speed study on an arterial street are given in the following table: Speed Grou ...

1. Results of a spot speed study on an arterial street are given in the following table: Speed Groups, mph Number of Vehicles Lower Limit Upper Limit 20.5 23.5 26.5 29.5 32.5 35.5 38.5 41.5 44.5 47.5 50.5 53.5 56.5 59.5 62.5 23.5 26.5 29.5 32.5 35.5 38.5 41.5 44.5 47.5 50.5 53.5 56.5 59.5 62.5 65.5 9 10 23 20 29 24 14 -12 10 Plot the histogram of the frequency distribution of the spot speeds. b) Compute the mean speed and the standard deviation of speed measurements. What is the significance of each of these measures? c) One criterion for setting the speed limit on a roadway is to assume that the proper speed limit has a decision rule is used, what consideration? Plot the cumulative 15% chance of being exceeded based on a spot speed study. If this speed limit do you recommend for the arterial street under frequency