Here are some video tutorials on making various kinds of charts and graphs in Power Point that can then be embedded on a WordPress site, courtesy of Emily Sherwood, ITF at Baruch!
How to build an Excel Pie Chart in PowerPoint on a Mac.
Learn to build an Excel Cluster Column Chart in PowerPoint.
Learn how to change your chart type from cluster column chart to stacked column chart and add a total label to the chart. Fancy.
How to build a line chart!