Average Temperature Calculation

A temperature anomaly was recorded over a week, with the temperatures on each day represented as rational numbers:

Day 1: $$ -2.5 $$ °C

Day 2: $$ 3.75 $$ °C

Day 3: $$ 1.25 $$ °C

Day 4: $$ -0.5 $$ °C

Day 5: $$ 4 $$ °C

Day 6: $$ 2.25 $$ °C

Day 7: $$ -1.75 $$ °C

What is the average temperature for the week?