The number of games is on the y axis of the graph while the number of balls made is on the x axis. To find how many games had 11 or fewer balls made we have to trace the number of games on the y axis to the number of balls made which are below or equal to 11.
5 games have 8 - 11 balls made
1 game also have 4 - 7 balls made.
Altogether 5 + 1 = 6 games had 11 or fewer balls made.
