Prepare introductory documents for below topic by doing some exploration on the web:

• Weightage Average of Values (Amount)
• Moving Average of Values
• Compounding Average Growth Rate
• Ranking in Statistics
• Indexing in Statistics (Simple Index)

Include contents in each part:

• Introduction
• Possible formula/calculation methods
• Pros/Cons if possible
• Example if possible.

Write in below format:

• H2: Topic
• H3: Contents