Speed (in kmh) Frequency Cumulative Frequency 0-19 3 5 20-39 16 40-39 26 60-79 37 .80-99 9 100-119 2 (a) For the class interval 20-39, as written in the table above, complete the following sentences. (1) The upper class limit is (1 mark) (ii) The class width is. (1 mark) (i) Sixteen vehicles passed a checkpoint at no more than kmh (1 mark) (b) (c) Complete the table shown above by inserting the missing values for the cumulative frequency column. (2 marks) On the grid provided on page 21, using a scale of 2 cm to represent 20 kmh on the r-axis. and 2 cm to represent 10 vehicles on the p-axis, draw the cumulative frequency curve 10 represent the information in the table. (4 marks) (6) On your graph, draw reference lines to estimate the speed at which no more than 50% of the vehicles drove as they passed the checkpoint. (1 mark) What is the estimated specd? (d) ***** (1 mark)
