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Go to Tools on the top toolbar and choose Excel Add-ins.
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Choose Analysis ToolPak and select OK.
For more info, see Use the Analysis ToolPak to perform complex data analysis.
Adding the Data Analysis ToolPak isn't currently possible in Excel for the web. You can, however, add the Data Analysis ToolPak in the Excel desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the Excel desktop app? Try or buy Microsoft 365.