78.38%
Nine.
30
The score would be 56%
The question does not specify what z is so this answer could be completely wrong. However, if the question is in the context of the standard Gaussian distribution, the answer is 0.493613 (to 6 dp)
90%.
Your answer is in your question unless your question is wrong.
83.33%
92 %
78.38%
You can get 60 questions wrong and get a 70 percent but if you get 61 wrong you are at a 69.5 percent.
Each question is worth 2.5 percent. You can get 8 wrong.
In order to score an 80 percent on a 70 question test, one can afford approximately 14 errors. This question can be calculated by taking 56 divided by 70,which equals 0.8. Take 0.8 and multiply that by 100 to get 80.
80%
Nine.
20
30