TEST A (mean=70%; std.dev=6%)
+--------------+-------+---------+-------+
| Participant# | score | z-score | x/avg |
+--------------+-------+---------+-------+
| 1            |    60 | -1.66   | 0.85  |
| 2            |    65 | -0.83   | 0.92  |
| 3            |    80 | 1.66    | 1.14  |
| 4            |    90 | 3.33    | 1.28  |
| 5            |    40 | -5.00   | 0.57  |
| ...          |       |         |       |
+--------------+-------+---------+-------+

TEST B (mean=75%;std.dev=7%)
+--------------+-------+---------+-------+
| Participant# | score | z-score | x/avg |
+--------------+-------+---------+-------+
| 1            |    60 | -2.14   | 0.8   |
| 2            |    70 | -0.71   | 0.93  |
| 3            |    80 | 0.71    | 1.06  |
| 4            |    90 | 2.14    | 1.2   |
| ...          |       |         |       |
+--------------+-------+---------+-------+