How to draw a bell Curve on Excel or SSRS

Dear all
I want to draw a Bell Curve on Employees End Year Rating.
Rating range is from 1 to 4 and it contains decimal places.
We have around 500 employees
I want to draw a bell curve how can I do this?
My tools are Excel 2010 and SSRS R2
Thanks,
RamzyNEbeidAsked:
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SteveConnect With a Mentor Commented:
Attached is an example using the NormDist function to plot a Normal Distribution (Bell Curve).

I have also added the Frequency function to plot the histogram
NormDist.xlsx
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LazyFolkCommented:
Not as easy as it seems...

have a look at this site :

http://tushar-mehta.com/excel/charts/normal_distribution/index.htm
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RamzyNEbeidAuthor Commented:
can you explain to me what is the:
 - "x axis step"
 - "Frequency"
 - E8 till E31

please
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SteveConnect With a Mentor Commented:
"x axis step" is just an arbitrary figure I picked out and then added up to form the x axis used to generate the curve. So I used x values going up in increments of 0.25. If you change this to .1 then the axis would increase by 0.1 ( this is just about making the graph "look right").

Frequency is the function applied to form the histogram data (an array formula: so entered using [ctrl+[shift]+[enter]) this takes the values in the table and fills the buckets to form the histogram for plotting along side the normal distribution. The histogram/Distribution buckets are in the range E8 to E31.

E8 to E31 are just the "buckets": the stages applied as per the x-axis step to give the varied "look" of the graph and to generate the points of the graph. For this it is about getting the range right so that the curve looks right on the graph, you can just type them in, but I find adding a single value to "step" makes it easier to change.
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