Lsumate the pulse rate of a student who weighs 65 kg. Comment on the reliability estimate. To investigate whether speed cameras have an impact on road safety, data was collected from several cities. The number of speed cameras in operation was recorded for each city, as well as the number of accidents over a 7 day period. Number of speed cameras (I) 19 7 15 20 3 16 17 28 17 24 25 20 5 16 25 15 Number of car accidents (y) 48 35 31 32 52 40 35 28 30 34 19 29 31 21 37 a Construct a scatter diagram to display the data. b Calculate r for the data. c Describe the relationship between the number of speed cameras and the number of car accidents. d Plot the mean point (I, y) on the scatter diagram, and draw a line of best fit through the mean point. Where does your line cut the y-axis? Interpret what this answer means