Formula to calculate percentage of Pass Rate

I need help with a formula on my report. We are looking to find the percentage of students who have passed.

The formula i have got are all showing as 25% which cannot be right. 

I have also created a Pass Count formula field on the ILM Assessment Answersheet object but every record is showing as a 0

IF(TEXT(Status__c) = "Pass",1,0)

What am i doing wrong? #Trailhead #Report Formula #Reports & Dashboards