68. Solving a chemistry problem

11. According to the experimental data on the dependence of the surface tension of aqueous solutions of surface-active substances (surfactants) on concentration (see Table 3) at 25 ° C, establish graphically whether this surfactant is colloidal or not, and if it is, determine the value of its critical micelle concentration ( KKM). In the table, concentrations are expressed in mmol/l and surface tensions in mJ/m2.
option number concentration
0.1 0.3 0.6 1 3 6 10
11 57 39 28 25 26 25 26

Your answer must be justified, although it may be ambiguous.