AB: recommended BC: recommended

MB: recommended ON: required

Teacher Resource 6.1 Unit 3 Probability and Data Management pp. D-3–9

New Canadian Edition

JUMP Math™ Copyright © 2018 JUMP Math

PDM6-1

Range and Scale

Students will:

• read and draw bar graphs when given a scale;

• choose a scale for a bar graph that doesn't require too few or too many markings; and

• compare data sets and draw double bar graphs.

AP Book 6.1 pp. 43–45

Graph Range

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The range is the set of possible output values, which are shown on the y-axis.

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Formula: Highest # - Lowest # = Range

_____ - _____ = ______

2. Find the range of the data

a) 89, 92, 91, 88, 92

b) 76, 90, 80, 84, 88

Graph scale

A graph scale, or simply scale, refers to a set of numbers that indicate certain intervals on a graph used for measurement.

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Start at ____, count by ______, stop at ______

If the graph has a “skip” then you start at the first number after it.

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If the graph does not have a “skip” then you start at 0.

What do these scales have in common?

See p. D-4 for details.

Hint: What do the zigzags show?

How are the scales different?

Exercises:

Describe the scale.

a) 16, 20, 24, 28, 32, 36

b) 60, 70, 80, 90, 100

What is your favourite season?

What would be a good scale to represent this data in a bar graph?

Did everyone vote?

Tally

Frequency

Hint: What's the greatest number of tallies?

See p. D-5 for details.

Let's plot this data on a bar graph.

Hint: What scale should we use?