gui: Show approx grade

guicommander.py

@@ -517,6 +517,10 @@ class OutcomeSummary(QLabel):
         for outcome, count in sorted(summary.items(), key=lambda item: order.index(item[0])):
             color = OUTCOME_COLORS[outcome]
             parts.append(f"<font color='{color.name()}'>{count} {outcome}</font>")
+
+        grade = 5 * summary['passed'] / sum(summary.values()) + 1
+        parts.append(f'≈ {round(grade, 2)}')
+
         self.setText('<br>'.join(parts))