Finding mean car accidents for a year from monthly periods

[lunds002]

Homework Statement

From January to September, the mean number of car accidents per month was 630. from Oct - Dec the mean was 810 accidents per month.

What was the mean number of car accidents per month for the whole year?

Homework Equations

The Attempt at a Solution

(630)(9) + (810)(3) = 675
12

 

[Mark44]

Looks good.

 

[lunds002]

Thanks, it just seemed too simple!