Statistics 5.5. The normal distribution

(9709) CIE A Level Maths 2023 - 2025

1. Revision notes

Key concepts

1. Continuous random variables: Infinite number of possible outcomes
• histograms
• area under curve = 1
• normal curve: bell shaped, symmetrical
• mean = median = mode
2. The normal distribution:
• The standard normal variable Z
• Critical values table
• Standardizing a normal distribution
• Modeling in real-life situations
3. Normal approximation to the binomial distribution
• continuity correction: used when we approximate a discrete distribution by a continuous distribution

2. Study Powerpoint

*or you can download it here.

* [PDF] Statistics formulae booklet (provided on exam)

3. Exercises (please click)

4. Solutions (please click)