Revise tasks and hints for biweekly incidence visualization

[avallecam]

Updated challenge tasks and hints for visualizing biweekly incidence in R Markdown.

• Please check if the PR fulfills these requirements

• I have read the CONTRIBUTING guidelines
• I created a new feature branch
• I have opened and refer to an issue or I am referring to an existing issue
• Lesson builds locally
• Checks have been run on GitHub and pass
• No output errors in the Rendered Changes link generated by github-actions

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

• What is the issue you are addressing?

• If contributing new additional material please explain why you think it is needed

• Other information:

[github-actions]

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Rendered Changes

🔍 Inspect the changes: https://github.com/epiverse-trace/tutorials-early/compare/md-outputs..md-outputs-PR-244

The following changes were observed in the rendered markdown documents:

 aggreagate-visualize.md | 22 ++++++++----
 md5sum.txt              |  2 +-
 renv.lock               | 95 +++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 112 insertions(+), 7 deletions(-)

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If you have source files that require output and figures to be generated (e.g. R Markdown), then it is important to make sure the generated figures and output are reproducible.

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⏱️ Updated at 2026-06-21 21:05:04 +0000