Averages and range · Year 10
In Year 10 you learn: the estimated mean of grouped data.
An average is one number that represents a whole set of data. The mean shares the total out equally. The median is the middle value. The mode is the most common value. The range measures how spread out the data are.
Key facts
- From a frequency table: mean = (Σfx)/(Σf).
Worked examples
Example 1
The table shows the goals scored in 20 football matches. Find the mean and the median.
Answer: Mean 1.5, median 1