Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Athletes | Country | Time | Notes |
| --- | --- | --- | --- | --- |
| 1.0 | David Cal | Spain | 3:58.756 | QF |
| 2.0 | Andreas Dittmer | Germany | 4:00.505 | QS |
| 3.0 | Aldo Pruna Díaz | Cuba | 4:02.351 | QS |
| 4.0 | Thomas Hall | Canada | 4:05.198 | QS |
| 5.0 | Andreas Kiligkaridis | Greece | 4:18.488 | QS |
| 6.0 | Yuriy Cheban | Ukraine | 4:23.188 | QS |
| 7.0 | Calvin Mokoto | South Africa | 4:33.887 | QS |
Question:
What is Calvin Mokoto's average rank?
Answer:
7.0