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How to Apply the Bell
Curve to Employee
Reviews
How to Make a
Frequency Chart
While it may seem simple in its concept, drawing a basic bell curve in Microsoft Excel
has long been a challenge for students and business professionals alike. Of course,
Excel doesn't know what shape you want charted. So if you want a bell curve chart, you
first have to enter the right data. In this tutorial, we select a range of numbers
corresponding to a Mean average and a Standard Deviation. After applying Excel's
Normal Distribution function to those numbers, Excel gives you a perfectly-formed bell
curve. While a bell curve does require quite a lot of data, Excel 2013's AutoFill feature
automates must of the work for you.
Excel needs appropriate data to illustrate a bell curve. (Image courtesy of Microsoft)
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Step 1:Decide on a Mean and a Standard Deviation. In this example, use a Mean of 60 and a
Standard Deviation of 10. To create a nicely shaped bell curve, you need to enter data
that is three standard deviations below the Mean and three standard deviations above
the Mean. Simply put, this means the numbers 30 to 90 in a single column.
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Use a Mean of 60 and a Standard Deviation of 10. (Image courtesy of Microsoft)
Step 2:Type "30" in cell A2 and "31" in cell A3. While it's possible to fill in the remaining
numbers manually, all the way to "90" in cell A62, it's much faster to let Excel do it for
you using Autofill.
Populate column A with data from 30 to 90. (Image courtesy of Microsoft)
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Step 3:Drag the cursor over cells A2 and A3 to highlight them. Right click the selected cells
and select "AutoFill" from the Context menu that opens. A blue arrow appears below
your selection.
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Right-click the cells to use AutoFill. (Image courtesy of Microsoft)
Step 4:Drag blue "AutoFill" arrow down to cell A62. Excel automatically fills the empty cells,
giving you a list of numbers from 30 to 90.
Autofill automatically populates the cells. (Image courtesy of Microsoft)
Step 5:Click cell "B2." This is where you will put the Excel function to calculate the normal
distribution for the number 30 in cell A2. This function requires three values: the
number in cell A2, the Mean and the Standard Deviation. You must also specify whether
the result should be cumulative or not. In this case, you don't want the calculation to be
cumulative, so use a value of "False." Type the following formula into cell "B2" to
calculate the distribution: =NORM.DIST(A2,60,10,FALSE)
Insert Excel's Norm.Dist function. (Image courtesy of Microsoft)
Step 6:Press "Enter" after entering the function. If you entered the data properly, Excel returns
a value of 0.00079155.
Properly entered, Norm.Dist gives you a very small fraction. (Image courtesy of Microsoft)
Step 7:Fill in cells B3 to B90 using Excel's AutoFill. Right-click cell "B2," select "AutoFill" from
the Context menu. The blue AutoFill arrow appears below the selected cell.
AutoFill the second column. (Image courtesy of Microsoft)
Step 8:Drag the blue "AutoFill" arrow all the way down to cell B62. Excel populates each cell
with the same formula used in cell B2. All of the data you need to create a bell curve is
now in the worksheet.
Highlight the data before creating a chart. (Image courtesy of Microsoft)
Step 9:Highlight all of the cells containing your data, from cell A2 to B62. Select a chart to
illustrate your data by clicking the "Insert" menu and selecting "Recommended Charts."
Excel automatically recommends charts showing a bell curve. (Image courtesy of Microsoft)
Step 10:Select any of the recommended charts. In this case, Excel first shows a scatter chart
with straight lines and markers. You can also select a line chart or a custom column
chart.
A scatter chart with lines and markers illustrates a bell curve. (Image courtesy of Microsoft)
Step 11:Drag the chart to where you want it to appear in the worksheet. Click the "Chart Title"
and type "Bell Curve" to rename the chart.
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Insert your chart and change its name to "Bell Curve." (Image courtesy of Microsoft)
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ReferencesTushar Mehta: Drawing a Normal Curve
Microsoft: How to Create a Bell Curve Chart
How to Make a Bell Graph inExcel
How to Apply the Bell Curve toEmployee Reviews
How to Draw Bell Curves inWord
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