====Question Difficulty====

===Description===

{{ :viz_engine:library:question_difficulty.png?300 |Progress Vs Time}}

===Sample url===

<code>
http://domoscio-viz-engine.herokuapp.com/questions_difficulty?knowledge_node_id=5
</code>

===Parameters===

^ Name ^ Type ^ Possible key => values ^ Status ^
| Knowledge Node ID | Data | knowledge_node_id=14 | Binding |