After you have created all the questions for your quiz go to the Administration block on the left-hand side of the screen and click on Questions.
As you create or edit questions you can decide how much each one is worth under Default mark.
Having added questions to your quiz, the number listed against Total of marks: is the total number of marks that all the questions in the quiz add up to. To make it easier for learners to understand how well they did, their marks can be converted into a percentage score if the number in the Maximum grade field is set to 10.00 or 100.00.
When a learner completes a quiz they are given both a mark and a grade. For example, in a quiz where the total number of marks adds up to 6.00, if the maximum grade is set as 10.00 then the learner is given a percentage that is easier to understand:
Marks 4.50/6.00
Grade 7.50 out of 10.00 (75%)
To set a pass boundary on a quiz that has a maximum grade of 10.00, go to Grade in the quiz settings and change the figure in the Grade to pass field to 5.00 for a 50% pass boundary, or to 7.50 for a 75% pass boundary, etc.