A bimodal graph in which the modes are at the extrema.
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The answer depends on what the graph is of: the distribution function or the cumulative distribution function.
You cannot because the median of a distribution is not related to its standard deviation.
They are values of the variable which may be determined from some graphs.
The median can be found out by drawing a perpendicular to the x-axis from the intersection point of both the ogives
A Box and Whisker Plot.