why is this off a little

[IrishDan48]

81 80 80 80 80 83 84 80 81 78 80 78 75 13 78.2 6.2
the formula I'm using is =AVERAGE(SMALL(C48:V48,{1,2,3,4.5,6})) when you do it manually it comes out to 6.5 but the formula gives you 6.2
Does anyone know how it does that?

[protonLeah]

4.5 <>4,5 !