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  1. Moodle
  2. MDL-69246

Question manual grading: floating point issues can lead to valid grades being rejected

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Details

    • MOODLE_35_STABLE, MOODLE_37_STABLE, MOODLE_38_STABLE, MOODLE_39_STABLE
    • MOODLE_38_STABLE, MOODLE_39_STABLE
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      1. Create a multiple choice with four possible answers:, single response question question with 4 choices:
        • Right answer (Grade 100%)
        • Wrong answer (Grade -33.3333333%)
        • Wrong answer (Grade -33.3333333%)
        • Wrong answer (Grade -33.3333333%)
      2. Add the question to a quiz
      3. From the Edit quiz page, change the question to be worth 0.75 (using the pencil on the right)
      4. Login as a student
      5. Attempt the quiz
      6. Choose the right answer.
      7. Login as a teacher
      8. Navigate to the quiz -> Attempts: 1
      9. From the table at the bottom, click "Review attempt" for the attempt just made
      10. Click "Make comment or override mark"
      11. Try to set the grade to values outside the allowed range -0.25 to 0.75.
        1. Verify that that the values are rejected (shown beneath the comment)
      12. Set the grade to -0.25.
        1. Verify that you are allowed to save it (no notice below the comment)
      Show
      Create a multiple choice with four possible answers:, single response question question with 4 choices: Right answer (Grade 100%) Wrong answer (Grade -33.3333333%) Wrong answer (Grade -33.3333333%) Wrong answer (Grade -33.3333333%) Add the question to a quiz From the Edit quiz page, change the question to be worth 0.75 (using the pencil on the right) Login as a student Attempt the quiz Choose the right answer. Login as a teacher Navigate to the quiz -> Attempts: 1 From the table at the bottom, click "Review attempt" for the attempt just made Click " Make comment or override mark " Try to set the grade to values outside the allowed range -0.25 to 0.75. Verify that that the values are rejected (shown beneath the comment) Set the grade to -0.25. Verify that you are allowed to save it (no notice below the comment)

    Description

      Steps to reproduce:

      1. Create a multiple choice, single response question question with 4 choices:
        • Right answer (100%)
        • Wrong answer (-33.3333333%)
        • Wrong answer (-33.3333333%)
        • Wrong answer (-33.3333333%)
      2. Add the question to a quiz - and set it to be worth 0.75 marks
      3. As student, attempt the quiz, and choose a wrong answer.
      4. As teacher, go in and try to manually override the grade.
      5. First set the grade to 0.75 and save.
      6. Then go back, and try to set the grade back to -0.25.

      Expected result: it works.

      Actual result: you are told that grade is out of range.

      Originally reported here: https://moodle.org/mod/forum/discuss.php?d=406658

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          People

            timhunt Tim Hunt
            timhunt Tim Hunt
            Eric Merrill Eric Merrill
            Andrew Lyons Andrew Lyons
            Anna Carissa Sadia Anna Carissa Sadia
            Safat Shahin, Tim Hunt, Ilya Tregubov, Kevin Percy, Mathew May, Mihail Geshoski, Shamim Rezaie
            Votes:
            2 Vote for this issue
            Watchers:
            6 Start watching this issue

            Dates

              Created:
              Updated:
              Resolved:
              14/Sep/20

              Time Tracking

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                1h 43m