Key Concepts
- Understanding Proportions: The ratio of a part to the whole, often expressed as a percentage.
- Scaling Proportions: Applying a proportion from a sample to estimate the corresponding value in a larger group.
Skills Covered
- Converting between fractions, decimals, and percentages.
- Multiplying proportions by population size to estimate totals.
Example Problems
- A sample of 120 students showed that 30 prefer online learning. Estimate how many of the 1,200 students in the school prefer online learning.
- A survey found that 25% of 80 sampled residents prefer a new park development. Estimate how many of the 8,000 residents support the project.