Answer 'How tall is the class?' using both the spread (minimum and maximum) and the centre (mean and median) of dot plots.
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Always describe both how spread out data is and where its centre is.
Describe data by its extremes and its centre.
What the three dot plots say about the Grade 5 class.
Problem. How tall is this class? Use the dot plots and the mean and median. (Textbook pp. 109–110)
Compare two groups' guesses of one minute.
Math Talk, Textbook p. 110. Two groups of children closed their eyes and opened them when they thought 1 minute had passed (no counting allowed). The book's dot plots give:
| | Mean | Median | Spread (from the dot plots) | |---|---|---|---| | Group A | 58.21 s | 60 s | from about 42 s to about 68 s, with a few low guesses | | Group B | 59.28 s | 59.5 s | bunched more tightly around 60 s |
Discuss how well each group did. Describe and compare the spread and the centre.
What do the means and medians say?
Which group's guesses vary more?
Use both spread and centre.
Questions on the Grade 5 heights.
The tallest and the shortest students in the class are…