A Note from “Your Crowning Glory”

I am having problems with caluclating the
average time in excel h:mm see example. Not sure what I am doing wrong.
215.34
239.26
142.45
60.84
128.43
110.65
36.15
65.66
41.69
60.09
23.42
25.46
17.09
17.72
9.79
14.20
13.39
47.37