If your version of Excel does not have the Data Analysis Tool, you have to install it. 

 

You can find many explanations on how to install the Data Analysis Tool by just Googling something like "data analysis tool in excel download" 

 

Below are some links that I found...

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https://itstillworks.com/download-microsoft-office-excel-analysis-toolpak-34359.html

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https://www.excel-easy.com/data-analysis/analysis-toolpak.html

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https://support.office.com/en-us/article/load-the-analysis-toolpak-in-excel-6a63e598-cd6d-42e3-9317-6b40ba1a66b4