This key facts covers Key Facts About Averages within Averages for GCSE Mathematics. Revise Averages in Statistics for GCSE Mathematics with 14 exam-style questions and 20 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 7 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Key Facts About Averages
- Mean: Add all values and divide by the number of values
- Median: The middle value when data is arranged in order
- Mode: The value that appears most frequently
- Each average tells us something different about the data
- Outliers (extreme values) affect the mean more than median or mode
Practice questions for Averages
What is the mode of this dataset? 3, 5, 5, 7, 9, 3, 5, 11
Class A has test scores: 55, 62, 58, 60, 61, 63, 57. Class B has test scores: 20, 60, 62, 63, 61, 58, 64. A teacher says 'Class A has a higher mean score, so Class A performed better overall.' Give a mathematical reason why this conclusion may be misleading.
Quick recall flashcards
What is the mode?
The mode is the value that appears most frequently in a dataset. A dataset can have no mode, one mode, or multiple modes.
What is the mean?
The mean is the sum of all values divided by the number of values. It's also called the arithmetic average.