Mean, median, mode and choosing a typical value

What this note covers

1. Three different answers to the question 'what is typical?'
2. The mean, by hand and from a frequency table
3. Grouped data and the midpoint method
4. The median: ordering and the middle position
5. The mode, the modal class and categorical data
6. Skew, outliers and choosing the right measure
7. Working backwards and comparing two data sets

7 sections · 12 key terms & formulas · 6 common mistakes