Peter's scores for 6 tests are shown in the table. Find this average score.
Tests | 1st | 2nd | 3rd | 4th | 5th | 6th |
Scores | 15 | 20 | 5 | 13 | 17 | 20 |
Tests | 1st | 2nd | 3rd | 4th | 5th | 6th |
Scores | 15 | 20 | 5 | 13 | 17 | 20 |
Tests | 1st | 2nd | 3rd | 4th | 5th | 6th |
Scores | 15 | 20 | 5 | 13 | 17 | 20 |
Tests | 1st | 2nd | 3rd | 4th | 5th | 6th |
Scores | 15 | 20 | 5 | 13 | 17 | 20 |
Tests | 1st | 2nd | 3rd | 4th | 5th | 6th |
Scores | 15 | 20 | 5 | 13 | 17 | 20 |