Five-number summary — Algebra I · Grade 9 or accelerated Grade 8, what it means and where it is taught
Minimum, Q1, median, Q3, maximum.
Taught in Algebra I · Grade 9 or accelerated Grade 8.
Where it is taught
What it rests on
Work through these first if this one does not settle.
- Median — Two kinds of centre: the balance point, and the middle value.
Practise this idea
2 questions in the course bank use Five-number summary, in Statistics: Centre, Spread & Displays.
Problem 1
Find the five-number summary of 5, 7, 9, 12, 15, 18, 21.
Worked answer
5, 7, 12, 18, 21
Min 5, max 21
Median 12
Q1 = 7, Q3 = 18
Problem 2
Which display best compares three groups at once?
- Side-by-side box plots
- A single dot plot
- A pie chart
- A scatter plot
Worked answer
Side-by-side box plots
Box plots show the five-number summary
Placing them side by side compares groups directly