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Fitness Tracker: Model a Logged Minute

Build nonuniform probability models from fitness tracker logs, step-count checks, and heart-rate recording trials.

Grade 7MathInteractive · Printable

Aligned to7.SP.C.7.b

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What’s included

Single worksheet
Auto-graded online
1 Common Core standard
Printable answer key
13 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

About this worksheet

What students practice

Students build probability models by dividing observed outcome frequencies by the total number of trials.
Students use frequency models to estimate probabilities of events involving steps and heart rate.
Students distinguish models for all recording attempts from models for successful readings.

How to use

Use after introducing relative frequency. Have students check that each complete model sums to 1, then discuss how missing readings affect the outcomes and denominator.

Curriculum

Common Core standard covered

7.SP.C.7.b

Build a probability model, which may not be uniform, from frequencies observed in a chance process.

Preview

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Name Date

Fitness Tracker: Model a Logged Minute

Use recorded frequencies to build probability models for tracker readings.

Model a Recorded Minute

For Questions 1–5, use the log below. Imagine selecting one of the 60 recorded minutes at random, with every minute equally likely. Write probabilities as fractions or decimals.

A fitness tracker recorded steps and heart rate during 60 one-minute intervals of a walking workout. Each minute belongs to exactly one row. Heart rate is measured in beats per minute (bpm).

Walking Workout Log
Steps in the minute	Heart rate (bpm)	Minutes recorded
Fewer than 100	Below 120	21
Fewer than 100	120 or higher	9
100 or more	Below 120	6
100 or more	120 or higher	24

Build a probability model with the four outcomes shown in the log.

Fewer than 100 steps and heart rate below 120:
Fewer than 100 steps and heart rate 120 or higher:
100 or more steps and heart rate below 120:
100 or more steps and heart rate 120 or higher:

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