Mutants and Masterminds is one of my favorite systems. The mechanics made excellent improvements on the d20 system. Since it uses a point-buy system, there is no real distribution of strength. Since it is based on the d20 system, though, which originally determined strength with a 3d6, I am using the 3d6 curve as a proxy of the distribution of strength within M&M.
Here is the lifting/dragging table for M&M 2nd ed. Weights are in pounds.