Type of Edit (select all that apply)

Add new content (definitions, codeblocks, etc.)

Description (optional)

We would like to edit the .mean() term entry in NumPy, Python. The entry lives in content/numpy/concepts/built-in-functions/terms/mean/mean.md

Please refer to the term entry template, content standards and markdown style guide when working on the PR for this issue.

Please:

• Add more examples.
• Add best practices and/or FAQ section.
• Add a header for the parameters under the syntax (i.e. "Parameters).

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