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Water Quality: Organize the Possible Records

Organize water-quality lab outcomes with lists, tables, and trees, then identify outcomes that meet event conditions.

Grade 7MathInteractive · Printable

Aligned to7.SP.C.8.b

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What’s included

Single worksheet
Auto-graded online
1 Common Core standard
Printable answer key
14 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 7
Subject: Math
Question types: Fill in the blank, Multiple choice, Circle the answer, Short answer, Drawing

About this worksheet

What students practice

Students represent compound-event sample spaces using organized lists, tables, and tree diagrams.
Students identify outcomes that satisfy conditions within a compound-event sample space.
Students account for restrictions when listing possible outcomes.

How to use

Have students trace each outcome through its list, table, or tree. Discuss how restrictions change the sample space before reviewing the final explanation.

Curriculum

Common Core standard covered

7.SP.C.8.b

List the sample space of a compound event with organized lists, tables, and tree diagrams, and find the outcomes in the event.

Preview

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Name Date

Water Quality: Organize the Possible Records

Use lists, tables, and tree diagrams to identify compound events.

Organize Reading Pairs

A community science lab measures water quality. Record outcomes in the stated order. A sample space includes every possible outcome exactly once.

A simplified display reports a nitrate reading of 0, 1, or 2 and a clarity category of clear (C) or cloudy (Y). Any reading can occur with either category. Codes give nitrate first, then clarity.

Complete the organized list by writing the missing codes.
Nitrate 0: 0C,
Nitrate 1: , 1Y
Nitrate 2: 2C,

Use the experiment in Question 1. Select every outcome in the event “the nitrate reading is below 2 and the water is cloudy.”

0C0Y1C1Y2C2Y

Two instruments each report a category: low (L), medium (M), or high (H). Every pair is possible. A code records the first instrument's category followed by the second instrument's category.