I have a question on an assignment that has got me beat. It is to do with the disintegration of an ice shelf, which was 14,000 km^2 at the beginning of march, and disintegrated to 2000 km^2 by the end of November. The question says given there are 275 days in a year show that average rate of disintegration is 7.3 km^2 day^-1.

Cant work this out, I thought the average is the same as the 'mean'? If I attempt to calculate the mean from the information given I get something very different than 7.3 km^2 day^-1.

Can anyone give me some advice?