A weather forecaster reported that the total amount of rainfall for the month was 0.75 inch. He also reported that this amount was 0.55 inch below the average of rainfall for the same month during the last ten years. The forecaster summarized his findings in this table.



Rainfall Findings

Amount of rainfall for the month: 0.75 inch

Compared to the average amount of rainfall for the month: -0.55 inch

What was the average amount of rainfall, in inches, for this month during the last ten years?