Respuesta :
to find the mean you add up all the numbers and then divide by the numbers you added by the numbers you already have
Answer:480
Step-by-step explanation: 460 was in August
320 was in September
440 was in October
560was in November
620 was in December
Add all together: 460+320+440+560+620=2400
2400:5(five months)=480
