Update syllabus.

Author: yenchiah

syllabus.md

@@ -127,11 +127,15 @@ Exams are onsite and will be conducted using the [ANS system](https://ans.app/).
 
 Exams contains only multiple-choice questions to test your general knowledge of data science and also coding knowledge. We will provide mock exams for you to practice.
 
-We will use guess correction for your score on the multiple-choice questions. Details about how the ANS system uses guess correction is in [this online document](https://support.ans.app/hc/en-us/articles/360014340098-Guess-correction). We enable the "Limit the guess correction to zero" option. The "Apply guess correction to answered questions only" option is disabled, which implies that you should always guess if you are not sure about the answer.
-
 {: .warning }
 > The University of Amsterdam owns the materials in this exam (e.g., the question sets), which means the materials are copyright-protected. You must keep the exam content confidential and are not allowed to copy or distribute the content in any form.
 
+### Exam Grade Calculation
+
+We will use guess correction when calculating your grade on the multiple-choice questions. Details about how the ANS system uses guess correction is in [this online document](https://support.ans.app/hc/en-us/articles/360014340098-Guess-correction). We enable the "Limit the guess correction to zero" option. The "Apply guess correction to answered questions only" option is disabled, which implies that you should always guess if you are not sure about the answer.
+
+We use the formula "1+9*obtained_points/total_points" to calculate your exam grade (defined as "mark" in the ANS system). Variable "obtained_points" means obtained points after guess correction. Variable "total_points" means the total points of the exam. For example, suppose that the exam has 25 questions, and each question worth one point. In this case, the total points will be 25. Details about calculating the grade is in [this online document](https://support.ans.app/hc/en-us/articles/360032871713-Calculate-a-mark).
+
 ### Cheat Sheet
 
 During the exam, you may bring an A4-size cheat sheet with you. You can choose to handwrite or print the content on both sides of the cheat sheet. After the exam, you can take the cheat sheet back with you.