0 +
    |
    |
    |
    |
  5 +
    |
    |
    |
    |
 10 +
    |
    |
    |
    |
 15 +*
    |
    |*
    |
    |*
 20 +*
    |
    |
    |**
    |*
 25 +
    |**
    |
    |*
    |*
 30 +
    |**
    |
    |
    |
 35 +
    |
    |
    |
    |
 40 +
    |
    |
    |
    |
 45 +
    |
    |
    |
    |
 50 +
    +---------+---------+---------+---------+---------+
NUMBER OF SCORES: 13, MEAN: 24.000000 +/- 4.961390