If you fancy digging down a bit further, then you might find this link interesting:

http://www.stat.cmu.edu/~ryantibs/darts/
Quick version........ a statistician called Ryan Tibshirani often played darts with one of his student friends at Stanford University. The friend was much better than Ryan who had the familiar problem of hitting 1s and 5s rather than the 20 he was aiming at. 'Just for fun' he decided to use statistics to decide where on the dartboard he should aim to maximise his scoring.

His results support the idea that '19 is a better target for poor players' but go much, much further and show that 'the optimum aiming point' follows a complex path around the board as the player's ability increases.

Ability can be measured by throwing 50 darts at the bull, recording the results and feeding them into a formula to obtain a personal 'deviation score'. This score can then be used to generate a personal 'Heat Map' showing the 'hottest' (white) areas to aim at for your current ability.

Its all good fun, especially if you enjoy maths, science or just tinkering.

You don't really need any mathematical skill. The link given above points to the original research paper (hard, even if you are into maths) and several 'simplified' articles which anyone can follow. It also shows where you can down load a 'Heat Map' to match your current ability.

This shows my efforts on the test and the matching Heat Map a few weeks after I started to play darts last year:

Basically, it shows that I was so bad that even throwing at 19 was too ambitious and that I should be aiming just above T7

The map below shows circles to represent 'deviation' based on your performance. The larger the circle, the less accurate you are and the more likely it is that your darts will miss your intended target.

It is obvious that the 20 represents the maximum reward BUT also imposes the greatest penalty.

The Heat Map is designed to show how reward v penalty changes as you aim at different targets and allows each player to select the optimum scoring area to match their ability.

Having spent quite a lot of time exploring this........ I'm still not totally convinced. I can't argue with the maths but I think that there are far more variables involved here and the danger of 'paralysis by analysis' is always present.

Anyway, its a fun way to spend a few minutes/hours/days broadening your darts practice routine