What are you having trouble with? Do you need something that looks like an
area chart, but with a bell-shaped curve, or do you just need a line or what
is the issue?
If you're just looking to eliminate the gap between the bars of a column graph:
Graph your data using the column graph, double click on the chart. Click on
the columns in the chart, click on Format, selected data series (there should
only be one), click on options, change the gap width to 0.
This will create a "traditional" looking histogram, however, as Echo points
out, an area chart would do this nicely.
What are you having trouble with? Do you need something that looks like an
area chart, but with a bell-shaped curve, or do you just need a line or what
is the issue?