Chronically absent students are 4.0× as likely to be failing a course
Students attending 98%+ of days average 90% with 4% failing at least one course. Under 80% attendance, the average drops to 75% and 54% are failing. Failure rates rise at every step down in attendance. Attendance and average grade are moderately correlated (r = 0.50). This is an association, not proof that absence causes failure.