The total course grade is always 100 when I set a based on the course grade restrict access condition on an activity.

• login with admin
• Create a Course c1
• add 2 assign modules with max grade 10
• on gradebook set Weighted mean of grades and Exclude empty grades and Maximum grade 10
• add 1 other activity (for example a certificate) and set restrict access with total course grade criteria with grade >= 6
• enrol a student
• go to the gradebook and assign the student 1 manual grade for the 2 assigns so that the average is 4
• login with student in anonymous session and you'll see the 3th activity certificate
• turn back on the windows with admin user, go to the certificate edit and set restrict access with total course grade criteria and set grade >= 60
• go back in the student windows and you'll don't see certificate
• turn back on the windows with admin user, go to the certificate edit and set restrict access with total course grade criteria and set grade >= 40
• go back in the student windows and now you'll  see certificate again

it seems that moodle always takes 100 as the basis for the total run but this is not correct as it is set to 10

NOTICE: in restrict access panel there's always the % symbol near grade criteria input text