Analyze this complete synthetic CSV; do not read another file or retrieve anything:
week,requests,within_one_day
1,40,30
2,50,35
Show each week's within-one-day rate, the difference in percentage points, and the combined rate as a fraction and percentage. Show formulas, preserve the counts, and explain why an unweighted average is not the combined rate. State the comparison's limits: no case-mix or satisfaction measurements were supplied. Return a table and short interpretation for human review; do not claim a cause or change source data.