The cumulative frequency graph shows the speed of 50 vehicles passing by a narrow road within 5 minutes.
If 8% of the 50 vehicles received a speeding ticket, find the speed limit on this road.[1]
Find the interquartile range of the speed of the vehicles.[2]
It was said that more than 50% of the vehicles are travelling at 45 km/h when passing through the narrow road. Explain, with reason, whether you agree with the statement.[1]