add a data set with the numbers you want to plot to the chart.
select the new data set
change the axis to secondary and then
<chart<chart type Select the line chart and hit enter
play with the formating and scale on the right side of the chart to make the
lines doo and look like you want.

" wrote:

I have fifteen numbers that I have added, averaged, found the median and
standard deviations for. I have charted these fifteen numbers as columns.
How do I display a line through the chart that can curve through the columns,
that is, one chart over the other?