About this topic
Before you begin
Interpret the mean as an equal share, recover a total from an average and combine groups using their numbers of values.
Learning goals
- Calculate and interpret the arithmetic mean
- Find a total from the mean and number of values
- Find the number of values from their total and mean
- Recover a missing or added value from a mean
- Combine group means through their totals and sizes
Syllabus statements covered
- Average as ‘total value ÷ number of data’
- Relationship between average, total value and number of data
In this topic
Average, total and number of values
Interpret the arithmetic mean as an equal share and recover totals before combining groups.