Take the largest value in the graph and subtract the smallest value from it.
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The domain consists of all values of x for which there is a point on the graph. Similarly, the range applies to all the y values.
range is the y values in a graph otherwise known as a function; for example in the graph y= abs(x), the graph is a v with the vertex at the origin and the range is (0,infinity).
On a coordinate grid, range is the y-axis.
If you are talking about statisitics, in a box and whisker graph it is the interquartile range.
a line graph would do the best or you could do the bar graph but it would be a bit longer to do