1. LOADING THE EXCEL ANALYSIS TOOLPAK ON YOUR COMPUTER
Click the Microsoft Office Button , and then click Excel Options.
Click Add‐Ins box, Select Excel Add‐Ins from the Manage drop‐down list (at the bottom) and click Go.

2. Select the Analysis ToolPak check box in the Add‐Ins dialog box and then click the OK button.
If an alert dialog box asking you if you want to install the add‐in appears, click Yes.
You will find the Analysis ToolPak under the Data tab on the tool bar.