Can You Draw the Perfect Circle?

Draw the best circle you can around the white dot in the middle, and you'll be given a score. 

The score is based on the average radius of your circle (represented by the green circle shown) and the standard deviation of the distance from every point to the center. 

Once you draw a circle, two lines will be drawn from the center to the shortest and furthest distances from the center (indicating the two biggest mistakes with your circle).

Don't forget to completely close your circle, or it will be considered incomplete!