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Swim Practice: From Lap Records to Models worksheet preview

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Swim Practice: From Lap Records to Models

Build probability models from swimming practice records, compare drills, and combine evidence from unequal groups of 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
  • 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

About this worksheet

What students practice

  • Students build probability models by dividing observed outcome frequencies by the total number of trials.
  • Students use frequency-based models to compare swimming practice outcomes and make decisions.
  • Students combine trial records using counts rather than averaging probabilities from unequal samples.

How to use

Have students count and classify the lap times before building models. Discuss why unequal numbers of trials matter when combining practice records.

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

OwlSheets.com

Name Date

Swim Practice: From Lap Records to Models

Use observed frequencies to model practice outcomes.

Model Lap Times

Use observed relative frequencies as estimated probabilities. Fractions or decimals are acceptable in probability blanks.

A swim team records ten practice laps under similar conditions. Each lap is one trial. For this worksheet, a lap means one length of the pool.
Practice Lap Times
LapTime (seconds)LapTime (seconds)
136637
240741
338838
442940
5391039
1.
To estimate the probability that a comparable lap takes 38 seconds, which calculation uses the record correctly?
  • A. Divide 10 by the 2 laps taking 38 seconds.
  • B. Divide 2 by the number of different times.
  • C. Divide 2 by the total of 10 recorded laps.
  • D. Divide 38 by the sum of all ten times.
2.
Build a model with three outcomes. Count each lap in exactly one category.

P(less than 38 seconds) =  
P(38 through 40 seconds, inclusive) =  
P(more than 40 seconds) =  

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