Hi,

Using the following data you can create an Area chart, changing the axis to
Time series rather than category.
Also set the number format for the axis to General. Adjust the scale setting
so major step is 10 days.

Students
0 0
70 0
70 40
90 40
90 0
100 0

Cheers
Andy
--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info
"Min Xu" wrote in message
...
I wanna show there are 40 students got the grade between 70 and 90. I
want to have both 70 and 90 on my horizontal axis, and a bar
representing 40 students standing in between the numbers. How am I
able to do this? Thanks a lot.