Change quiz statistics report to improve usability with random questions

To test this you will need to have some questions on the question bank so we can add those to the quiz.

1. Log in as admin.
2. Use the attached backup file to create a new course that includes a quiz with some random questions and some attempts
   • Or alternatively:
     1. If you don’t have a course, create one let’s name course1.
     2. Enrol few users as students, let's say s1, s2, s3...
     3. Go to that course, click on the cog and select More…
     4. On the Question bank section, click Import.
     5. Select Moodle XML format on the File format section and add the attached file to the file manager and click Import.
     6. On that course, turn editing mode.
     7. Add a quiz, with the default settings and click Save and display button.
     8. On the quiz main page, click on the cog and then select Edit quiz.
     9. On the right side, click Add and add a few new questions of different types (can be any)
     10. Click on Add again but this time, click a random question
     11. When the modal opens, select 10 on  Number of random questions field.
     12. Add few more new questions to the quiz.
     13. Then, add just 4 random questions.
     14. Log in as one of the students you enrolled in that course and attempt that quiz.
     15. Repeat with the other users.
     16. Log in again as admin again.
3. Go to the Quiz in the course.
4. Click on the cog, and select Grades under Results section.
5. Click on each attempt that has a link Not yet graded, (if there is any; otherwise skip this step) and once the attempt is loaded add a grade to questions that don’t have an automatically generated grade.
6. Go back to quiz main page, click on the cog and select Statistics under Results
7. Make sure none of the Random question titles has a link.
8. Make sure a new row is displayed right after all random questions.
   • It should display "Range of statistics for these questions" and then a link View details, Open that link on a new browser tab.
9. Make sure that the new row mentioned above, displays min and max values (in the format of {min} − {max}. For example 2 − 6 or 0% − 100%) of the summarised questions (that you can see on the new tab you opened above) for each column.
10. Confirm that the minimum and maximum values are correct.
11. Confirm that the new summary row's title is highlighted if at least one of the summarised questions (at the new tab) is highlighted