Quiz Calculations: Multiple Select Question type

Trabla: How to calculate score in "multiple select" question type of Quiz

Solving:

Multiple Select questions - two main scoring principles:
1. "All or Nothing"
2. "Partial Credit Possible"

1. "All or Nothing"
- all correct answers should be selected, none incorrect shouldn't be selected.
If all correct answer selected and one incorrect - score 0.

2. "Partial Credit Possible"
- each answer has own part of score , selected correct and not selected incorrect  - increase total score, not selected correct and selected incorrect - decrease total score. 


We get max score of question / quantity of answers = each answer score.

If we select correct answer - we add answer score to total score.
If we don't select correct answer - we minus answer score from total score.
If we select incorrect answer - we minus answer score from total score.
If we don't select incorrect answer - we add answer score to total score.

Minimum value for Total score  - 0, if get less round to zero.

Example:
 Question: Cat is ..? (Max score: 100 points )
A1: an Animal  ( if selected + 25 points , if not selected - 25 points )
A2: not a Dog ( if selected + 25 points , if not selected - 25 points )
A3: a Dog ( if  NOT selected + 25 points , if  selected - 25 points )
A4: a Color( if  NOT selected + 25 points , if  selected - 25 points )


Based on article:
https://eee.uci.edu/help/quiz/calculations/