A simple dart board is constructed of two concentric circular regions. The radius of the inside circle is 20 cm. The radius of the outside circle is 40 cm. Region 1 is worth 10 points and region 2 is worth 5 points. If people were to randomly throws darts at the board, what would you predict their average score to be after each person threw 50 times? Darts can not land outside the circles.

Show your work and explain your reasoning.