The Carbondale Hospital is considering the purchase of a new ambulance. The decision will rest partly on the anticipated mileage to be driven next year. The miles driven during the past $5$ years are as follows: Year$12345$Mileage$3$ comma $1003,1004$ comma $0504,0503$ comma $4503,4503$ comma $8503,8503$ comma $7503,750$ Part $2$a$)$ Using a $2-$year moving average, the forecast for year $6=$ enter your response here miles $($round your response to the nearest whole number$).$