Scores of an iq test have a bell shaped distribution and a standard deviation of 18. what percent of people have an iq score between 46 and 154? what percent of people has an iq score less than 64 or greater than 136? what percent of people has an iq score greater than 136?

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).