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Precision is a measure of repeatability.


Accuracy is a measure of how close to the actual value.


Think of darts:


Precision means that you have a very tight grouping, the dart hits the same spot every time, even though it may miss the bulls eye.


Accuracy means that the dart is close to the bulls eye, it might even hit the bulls eye every time, but it may have a wider grouping than above.


You can make a similar analogy with time.