Answer:
6.4 minutes
Step-by-step explanation:
The minimum waiting time is zero minutes (arriving exactly at the same time as the train), and the maximum waiting time is 16 minutes (arriving exactly after a train has left), therefore the time range is 16 minutes. If the waiting times are uniformly distributed, the 40th percentile is simply given by:
[tex]P = 0.40*16\\P=6.4\ minutes[/tex]
The 40th percentile for the waiting times is 6.4 minutes.