The "frequency curves" are called waves. The highest point of a wave is the crest.
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A parabola is NOT a point, it is the whole curve.
the curve should be located in the center of the graph.
In the context of: In the sequence 1,5,8,4,7,2,6,4,8,4,4,4,6,4,4, What number has the highest frequency? It refers to the meaning of what number is most often So the answer is 4 in this case
You find the slope of the tangent to the curve at the point of interest.
The slope of a curved line changes as you go along the curve and so you may have a different slope at each point. Any any particular point, the slope of the curve is the slope of the straight line which is tangent to the curve at that point. If you know differential calculus, the slope of a curved line at a point is the value of the first derivative of the equation of the curve at that point. (Actually, even if you don't know differential calculus, the slope is still the value of the function's first derivative at that point.)