Most probable kinetic energy is the energy possessed by the maximum number of reactant molecules at a temperature T, and it is shown as a peak on the Maxwell-Boltzmann energy distribution graph (fraction of molecules versus Kinetic energy).
With the increase in the temperature (T + 10 o), the peak shifts forward but downward so the most probable kinetic energy increases and the molecules possessing it decreases.
What it means is that earlier the kinetic energy was less, but due to the increase in temperature, there is an increase in the kinetic energy and a decrease in the activation energy so now more molecules can attain the threshold value for the reaction to occur.
In short, as the Kinetic energy increases more molecules now undergo effective collisions and achieve the threshold energy value decreasing the fraction of molecules having most probable kinetic energy that eventually will result in more molecules reaching the product formation stage.