Answer:
-40°
Step-by-step explanation:
-13° + -7° = -20°
-20° + -3° = -23°
-23° + 5° = -28°
-28° + -12° = -40°
- 13 - 7 + 5 -12
-30/5= -6
sum of all observation/total observation
(-13-7+5-12)/5
-30/5
-6
