How can I do this kind of chart ?

[fredericvillemi]

Hello,

I would like to do a graph with date on x axis and a price on y axis.

For each date I can have many dots and I want to show them and I also want to show a line with average or median of all the points (from current date and before)

How can I do ? (with standard charts or extension ?)

Thanks

Here is an example of what I would love to do :