I want someone able to explain the two examples page 5-6 attached in the file

I am looking for someone who can explain two examples on pages 5-6 of the attached file. I have attempted to understand them, but I am still confused about the mathematical calculations involved. I am open to both written explanations and video tutorials that can help me gain a conceptual understanding of the examples and their application in real-life scenarios.

Ideal Skills and Experience:
- Strong background in mathematics and statistics
- Experience in explaining complex concepts in a clear and concise manner
- Ability to provide both written explanations and video tutorials
- Familiarity with real-life applications of mathematical concepts would be a bonus