If a person is throwing darts at a target, and shoots three in a row in the same spot on the 20 section outer ring, but none in the bullseye, this person's throwing could be described

precise and not accurate.

Explanation:

1) Precise means that the result have low variation, i.e. all the results are close to each other. So, given that the person manages to throw the 3 darts in the same spot, that person is has high precision.

2) Accuracy refers to the ability to be close to the wanted point (in scientific work this is the true value). Therefore, since the darts land out of the bullseye they are not accurate.