Young Geniuses · Ages 13 to 14
Box Plot Analysis
Read box-and-whisker plots and find the IQR and range. A Grade 8–9 statistics worksheet with answer keys.
The learning journey
Every activity is one step. Here is where this one fits.
- PlayLearn the idea in a game
- Practise(you are here)Lock it in on paper
- ReviewCome back and keep it sharp
- MasterTake on a harder challenge
- AchieveEarn a certificate
About Box Plot Analysis
Box Plot Analysis gives upper-secondary learners practice reading box-and-whisker plots and calculating the statistics that describe a data set’s spread. Each worksheet shows a box plot marking the minimum, lower quartile, median, upper quartile and maximum, and the student reads off the median and works out the interquartile range and the range. Interpreting box plots and computing the interquartile range is a core Grade 8 to 9 statistics expectation across the US, UK, Canada and Australia, and box plots are one of the clearest ways to compare the spread and centre of data sets at a glance. Reading a box plot well means understanding that the box spans the middle half of the data and that the interquartile range, the width of the box, measures spread while resisting the influence of extreme values. The plot is drawn clearly on a labelled scale so students can read each value accurately. The five levels vary the five-number summary so the worksheet stays fresh and reusable. Each page prints cleanly on a standard A4 sheet, and every level downloads with its own answer key giving the median, interquartile range and range. There is no advertising and no sign-up.
Common questions
- What is the interquartile range?
- The width of the box, Q3 − Q1, measuring the spread of the middle half of the data.
- What grade is this for?
- Grade 8 to Grade 9 learners aged 13 to 14.
- Is an answer key included?
- Yes, every level gives the median, IQR and range.
A hand for grown-ups
- Before you start
- Find a calm few minutes with no rush. Let your child know it is fine to find some of it tricky — that is what practice is for.
- While they work
- Sit nearby but let them lead. If they get stuck, ask "what could you try?" rather than giving the answer — the thinking is the point.
- Afterwards
- Ask them to show you one they found easy and one they found hard. Praise the effort on the hard one, not just the right answers.
- Watch out for
- Rushing. If answers come too fast and wrong, slow the pace down together rather than pushing for more.
- Away from the screen
- Look for the same maths in everyday life — counting stairs, sharing snacks, spotting shapes on a walk.
Where to go next
Chosen by the skills this activity practises.