How to assign data group from measurement

hi guys i am a newbie here in matlab

i am running tire test to determine Miu and Slip and in the end to plot Miu-Slip. The measurement data i get is in .tdms file. i run the test from Slip 0% to 35% but the Slip values are not smooth from 0 to 0,35. so it goes back and forth until reach 0,35. example; Slip 0,4 ; 0,35; 0,36; 0,32; 0,38; 0,42; 0,44; 0,43; 0,45;... and so on till 0,35. When i plot the Mu vs Slip, it looks like not so good and not smooth at all..

i think because the Slip values go back and forth like that. so i wanna ask, how can i group the Slip data and get the mean value for a certain data group; e.g.: every 10 Slip values and get the mean value. maybe the plot would be better.

thanks guys for the help!

[Von Duesenberg]

If your data is in a table, have a look at the findgroups and splitapply functions in the documentation.

[Davin Farrell Lukito]

my data is in tdms file, and in workspace, i can see the data is a matrix from 227.000x1