No, the best fit line need not go through any data point on a graph.
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nonlinear graph
A graph that has its data represented in little symbolic pictures.
no its false
In a Frequency Polygon, a line graph is drawn by joining all the midpoints of the top of the bars of a histogram. A frequency polygon gives the idea about the shape of the data distribution. The two end points of a frequency polygon always lie on the x-axis.
A point can represent a piece of data or an (x,y) value.