The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway, Complete the cumulative frequency and relative frequency and answer the following questions based on it.( Round relative frequency up to 2 d.p.) Speed Miles per hour Frequency Cumulative frequency Relative frequency 50-55 2 55-60 4 60-65 5 65-70 10 70-75 9 75-80 5 f. . What is the Mid Point of third class Time left for this