The success ratio is depicted in Fig. 8. The RRT-MP planner is
able to find a solution for all start/goal pairs for all three robots. The
RRT-CPG fails only a few times for the Lizard robot. Unlike these
algorithms, RRT-K cannot find a solution in several cases for S-bot
and Quadropod robots. Moreover, the 90% interval of success ratio
for the Quadropod robot is from 0% to 100% and the median is 80%.
This means that for 50% of the start/goal pairs, the success ratio of
the RRT-K planner is worse than 80%.