What is the mean of {2.5,4.5,6.5,8.5,10.5}\{2.5, 4.5, 6.5, 8.5, 10.5\}{2.5,4.5,6.5,8.5,10.5}?
5.55.55.5
6.56.56.5
7.57.57.5
8.58.58.5