Find the mean number of fatalities
year Year 1 Year 2 year 3 Year 4 Year 5 Year 6 Year 7
deparure 10.9 11.3 10.5 10.3 10.1 10.8 10.9
Fatal Accidents 2 2 5 1 2 0 3
Fatalities 15 90 527 1 23 14 23

Year 8 Year 9 Year 10
10.5 10.8 10.5
1 1 1
50 1 1