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