Let us suppose that you take a test with 5 questions. You answer three correctly, one incorrectly, and you leave one question unanswered.
Your percentages will be: 60% correct, 20% incorrect, 20% unanswered.
The number of users answering same questions:
|
|
Correctly |
Incorrectly |
No Answer |
|
Q1: (out of 30 users) |
5 |
15 |
10 |
|
Q2: (out of 70 users) |
9 |
11 |
50 |
|
Q3: (out of 20 users) |
2 |
8 |
10 |
|
Q4: (out of 2 users) |
1 |
1 |
0 |
|
Total: |
17 |
35 |
70 |
Q1: 30 people had this question in their test and submitted the test including this question.
Q2: 70 people had this question in their test and submitted the test including this question.
Q3: 20 people had this question in their test and submitted the test including this question.
Q4: 2 people had this question in their test and submitted the test including this question.
Out of 30 people the correct answer for the question Q1 was given by 5 users;
Out of 30 people an incorrect answer for the question Q1 was given by 15 users;
Out of 30 people for the question Q1 10 users did not give any answer;
Out of 70 people the correct answer for the question Q2 was given by 9 users;
Out of 70 people the incorrect answer for the question Q2 was given by 11 users;
Out of 70 people for the question Q2 50 users did not give any answer;
...and so on.
The statistics is going to be the following:
Total Correct Answers: Total Correct Answers / (Total Correct Answers + Total Incorrect Answers + Total Unanswered Questions) * 100% = 17 / (17 + 35 + 70) * 100% ≈ 14%.
Total Incorrect Answers: Total Incorrect Answers / (Total Correct Answers + Total Incorrect Answers + Total Unanswered Questions) * 100% = 35 / (17 + 35 + 70) * 100% ≈ 29%
Total Unanswered Questions: Total Unanswered Questions / (Total Correct Answers + Total Incorrect Answers + Total Unanswered Questions) * 100% = 70 / (17 + 35 + 70) * 100% ≈ 57%