AC9M7ST02Year 7StatisticsPractised on site

AC9M7ST02 — Year 7 Statistics

Official Curriculum Content Description:

create different types of numerical data displays including stem-and-leaf plots using software where appropriate; describe and compare the distribution of data, commenting on the shape, centre and spread including outliers and determining the range, median, mean and mode

Worked Examples (1)

Example 1Stem-and-Leaf Plots
The stem-and-leaf plot below shows a set of test scores. Find the range of the scores.
Test Scores
StemLeaf
12 5 7 8
23 4 5 5
30 1 5 7
42 2 5
Key: $2 \mid 3 = 23$
Common mistake: Reading the leaf values only without attaching their stem value.
Correct Answer:3333
Worked Solution:
1. Identify the maximum value: 4545. 2. Identify the minimum value: 1212. 3. Range=45−12=33\text{Range} = 45 - 12 = 33.

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