The average quiz score is rounded to the nearest whole number, so to qualify as a 100% quiz, the average must be 4.5 or better in a 5-question quiz, or 9.5 or better in a 10-question quiz, and so on. The quizzes are ranked by the percentage of quizzers who got every question correct, ranging from 91% for the quiz ranked 1st, down to 67% for the one ranked 25th.