Specifying optimistic, pessimistic, and most likely or mode times are sufficient to generate the beta distribution describing completion times. The applet opens with values Optimistic $=2$ weeks, Pessimistic $=11$ weeks, and Mode $=4$ weeks. Drag the mode line inside the distribution to see how the shape changes as expectations about the most likely outcome change. Drag between $0$ and the current Optimistic value to change the Optimistic value. Drag, in either direction, beyond the upper end to change the pessimistic value. What is the mode when the distribution is symmetric