User sees the percentage of correct and incorrect answers submitted for each graded and ungraded problem for learner group

[crathbun428]

User Story
As a course author, I want to the percentage of correct and incorrect answers submitted by the learners in my learner group for each graded and ungraded, so that I can see how learners in my learner group are doing in comparison to the rest of the learners in my course and gauge the difficulty level of the problems in my course.

Acceptance Criteria
Scenario: A course author can view the percentage of correct and incorrect responses submitted for each problem in their course by the learners in their learner group
Given I am a course author with X permissions
When I view the performance section of the learner group reports
Then I see the percentage of correct and incorrect answers submitted for each graded and ungraded problem in the course by the learners in my learner group