① Mode and rangeNo calculator
The mode is the number that appears most often. The range is the largest number minus the smallest.
Practice questions
② MedianNo calculator
Put the numbers in order, then find the middle one. If there are two middle numbers, find halfway between them.
Practice questions
③ MeanCalculator useful
Add up all the numbers, then divide by how many numbers there are.
Practice questions
④ Comparing two sets of dataCalculator useful
Use an average to say which is higher, and the range to say which is more consistent.
Practice questions
⑤ All four togetherCalculator useful
Find the mean, median, mode and range of the same set of numbers.
Practice questions
Challenge questions
Changing a set of numbers, missing values and combined means
Key steps
Mean: total ÷ how many numbers. Total = mean × how many numbers.
Median: the middle number once the numbers are in order. Two middle numbers? Find halfway between them.
Mode: the number that appears most often (there can be more than one mode).
Range: largest − smallest. A smaller range means the numbers are more consistent.