Put your midpoint values in a column, and the corresponding heights in the
next column. Select this data and create an XY chart, using one of the
options with connecting lines between points.

- Jon
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Jon Peltier, Microsoft Excel MVP
Tutorials and Custom Solutions
Peltier Technical Services, Inc. - http://PeltierTech.com
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"Benny" wrote in message
...
I am trying to create a frequency polygon using mid-point values for the
horizontal axis, and heights from a source.