What it mean average of these five numbers 2 4 5 6 8

Question 5 spring semester final exam math evaluate

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list