{"id":"trim-mean-safe-under-constraints","text":"Division by zero cannot occur in `trimMean` when `len(arr) >= 20`, since the trimmed slice retains at least `len(arr) - 2*(len(arr)//20)` elements (minimum 18 for a 20-element input).","truth_value":"IN","source":"entries/2026/06/06/mean-of-array-after-removing-some-elements-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"trim-mean-safe-under-constraints","truth_value":"IN","reason":"premise"}]}}