Context. Keep only the rows whose score passes a threshold.
Your task. Write rows_where_score_ge(df, threshold) that returns the rows of df where score >= threshold. Preserve original row order.
Example. scores [90, 75, 85, 60], threshold=80 → rows with scores 90 and 85.
Notes. Threshold higher than every score → empty DataFrame. Threshold lower than every score → all rows.