Good accuracy means the dart average position would be near the target, which was in the middle. But if the precision is poor that means the position of the dart to each other was too far.
The example case for this condition would be if the dart is put on the leftmost, rightmost, uppermost and lowermost part of the target. If you averaged them, you will found that it would be in the middle. But the distance between those darts is too far so it wasn't precise
