141. Solving a chemistry problem

In standard CdSO4 solutions with different Cd2 activities, the electrode potentials of a cadmium selective electrode relative to silver chloride were measured

acd, mol / L 1.0 * 10-1 1.0 * 10-2 1.0 * 10-3 1.0 * 10-4 1.0 * 10-5
E, mV 75.0 100 122 146 170
Based on these data, a calibration graph was constructed in the coordinates E - paCd. The test solution of cadmium salt with a volume of 10.00 ml was diluted with water to 50.00 ml in a volumetric flask and the electrode potential of the cadmium selective electrode in the resulting solution was measured - Ex, mV 94.0
Determine the activity (mol / L) of the test solution of cadmium salt