In the Bin Worksheet, right-click on the value and choose Copy. In the Graph, right-click anywhere and choose either Paste or Paste Link.
If you choose Paste Link, then the Table object created links back to the Bin Worksheet and will update if the source data for the Box Chart changes. But be warned that linking may produce the wrong value if the data is binned in a different way such that more or less bin rows are created.