75% or C
6
every question is 2 points
17/19 = 89% = B+
90+10 divided by 2=50
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%
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).
87% or B+
75% or C
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