Which measure should Raul use to learn how far apart the upper and the lower quartile of the distances he hit the ball are?

Raul is practicing for baseball tryouts. he wants to find out how far he can hit a baseball. he hits the ball 10 times and measures the distance the ball travels each time. part a which measure should raul use to learn the average distance he hit the ball?

Y=-2x-6 is the answer