Add Excarta mean/stddev

[jacobbieker]

Pull Request

Description

Please delete the italicised instruction text! Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes #

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] Yes

If your changes affect data processing, have you plotted any changes? i.e. have you done a quick sanity check?

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.29%. Comparing base (d6bc438) to head (0c9fa0e). Report is 3 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #296 +/- ## ========================================== + Coverage 76.53% 77.29% +0.75% ========================================== Files 125 125 Lines 5907 6166 +259 ========================================== + Hits 4521 4766 +245 - Misses 1386 1400 +14 ```

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