Load frequency histogram in Print composer

This is currently not possible.

There is a related feature request to provide an export for the vector classification histogram.

Mostly, this may be possible with the upcoming QGIS 3.0 version (use the weekly build to try).

QGIS 3.0 with Data plotty plugin;

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Add: QGIS 2x, you can do the graduated frequency only with the numeric data field.

QGIS 3x with dataplotty, you can even use text field.

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