Step by Step: Viewing Statistics for a Classic Quiz in a Concluded Course

Step 1:  Enable Concluded and Inactive enrollments in the grades first by using this guide:
Step by Step: Viewing Grades for Concluded Students.

Step 2: Navigate to the quiz that you need statistics for.

Step 3: In the website URL append a forward slash ( / ) and the word "statistics" at the end of the URL as seen in this example:

Before: 

https://icampus.instructure.com/courses/123456789/quizzes/123456789

After:

https://icampus.instructure.com/courses/123456789/quizzes/123456789/statistics

Step 4: Press enter to load the url. If the quiz has submissions they will show as follows: