A (96%)
75% or C
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every question is 2 points
If you got 2 questions wrong out of 12, you answered 10 questions correctly. To calculate the grade, divide the number of correct answers (10) by the total number of questions (12), which gives you approximately 0.833. Multiplying by 100 for a percentage results in a grade of about 83.3%. This would typically be rounded to an 83% or a B grade, depending on the grading scale used.
17/19 = 89% = B+
75% or a "C".
To get at least 90% on a 50 question test, you can miss no more than 5 questions.
2 * (50 - x) = 70 50 - x = 35 x = 15 You can miss 15 questions.
Missing two questions = getting eight questions correct. 8/10 = 80%
You can solve this in two steps * First find out how many questions you DIDN'T miss. * Then convert (questions not missed) / (total questions) into a percentage. The above assume that you want a percentage; it also assumes that all questions have the same weight.
Even if you assume the questions are all worth the same number of marks, the answer may well depend on the grade boundaries.
77%
83%
87% or B+
75% or C
Think about it this way: If you have 50 questions, each one would be worth 2 points in order to make a grade of 100. That means you can miss 5 questions before you get down to 90 (5 x 2 = 10).
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