Using this graph, find the average lengths of cellular calls for the year 2013.
Year:|Avg length (L) in minutes:
1999|2.38
2000|2.56
2001|2.74
2002|2.73
2003|2.87
2004|3.05
I think the answer is 4.08 minutes but I also got 3.97 so I'm not sure, can you tell me if I'm right?