You want to find the average cost of the transportation you used.

Train tickets: $8.50

Coach tickets: $7

Bus tickets: $5.70

Taxi fares: $9

Flight tickets: $180

The mean average is given as $42.04.

Which cost distorted the data?

The flight ticket was the outlier in this set of data. Every other ticket cost under $10, but the flight cost was $180. This pulled the average value of each ticket way out to the right, increasing it by over 5 times, when the average value of the other four tickets was under $8 each.