Normal distribution
Use the normal distribution to calculate probabilities; standardise using z-scores
What you'll learn
- 1
Imagine you and 99 friends all measure your heights. Most of you will be around the same height, with a few very short and a few very tall people.
- 2
What shape does a normal distribution look like?
- 3
Here's a normal distribution curve. The middle is the average, and the curve shows how data spreads out symmetrically.
- 4
Let's find the percentage of data within 1 standard deviation of the mean.
- 5
Drag the slider to show where 95% of the data lies under the normal curve.
- 6
What percentage of data is within 2 standard deviations of the mean?
- 7
If the mean height is 170 cm and standard deviation is 10 cm, what range covers 68% of people?
Practise Normal distribution with Whizlo
Free AI-tutored lessons, unlimited practice questions, and progress tracking for ages 16–18. Aligned to the UK National Curriculum.