14. Transportation engineers are considering changing the speed limit on a rural road. Every day for I week, a technician records speeds of vehicles using the road in kilometres per hour. Here is a representative sample of data: 76 1 74 78 75 69 68 87 90 73 70 1 72 85 78 72 70 4 75 / 75 4 76 1 65 68 a) What are the quartiles for this data set? b) Determine the 85th percentile speed for these data. c) The current speed limit on this road is REDUCED 70 km/h. Based on these data, would you recommend changing it? SPEED What other factors should be considered? HEAD In Your Own Words