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The slope of the curve at each point on thegraph is the speed at that point in time. (Not velocity.)
The rate of change in accelleration.
The slope of the speed/time graph is the magnitude of acceleration. (It's very difficult to draw a graph of velocity, unless the direction is constant.)
A bell curve reaches its highest point in the middle and is lower on the sides. It can represent standard deviations from the mean.
The slope of a curved line at a point is the slope of the tangent to the curve at that point. If you know the equation of the curve and the curve is well behaved, you can find the derivative of the equation of the curve. The value of the derivative, at the point in question, is the slope of the curved line at that point.