999 West Dundee Road
Wheeling, Illinois 60090

Phone: 847-537-8270

Superintendent: Dr. Michael Connolly

School Board & Administration



CCSD21 is a school district comprised of 13 schools across 6 different communities in the northwest suburbs of Chicago.



School District 21 prides itself on its Professional Learning Community and its rich tradition of professional collaboration, high levels of professional development, and family-like atmosphere. If you see the opportunity to work with colleagues in making a difference in the lives of students and families in a truly diverse setting, School District 21 seeks your application.

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Statistics and Probability

Critical Content

Power Standards

  • Use random sampling to draw inferences about a population. (7.SP.1-2)
  • Find probabilities of simple and compound events. (7.SP.8)


Concepts and Skills

* Power Standard Content

  • * Understand meaning and value of random sampling
  • * Use samples to draw inferences
  • Compare two data distributions
  • Use measures of center and measures of variability to draw inferences about two populations
  • * Identify probability as a number between 0 and 1
  • * Utilize experimental and theoretical probability models
  • * Find probabilities of compound events


Critical Language

Language Usage

  • A student in 7th grade can demonstrate the ability to apply and comprehend critical language by investigating situations to find probabilities, and interpreting results and analyzing data.


Content-Specific Vocabulary

  • Random
  • Samples
  • Data distribution
  • Measures of center
  • Measures of variability
  • Probability
  • Experimental probability
  • Theoretical probability
  • Compound event
  • Tree diagram
  • Area model
  • Outcome
  • Event
  • Likely
  • Unlikely
  • Certain
  • Impossible
  • Equally likely
  • Population


Process-Specific Vocabulary

  • Sampling
  • Inferences
  • Compare


Concept-Based Connections

Essential Understandings

  • Data collection and analysis allows us to make more accurate inferences and predictions.


Factual Guiding Questions

  • How do you determine experimental probability?
  • How do you determine theoretical probability?
  • What are the possible outcomes that can occur for the events in a given situation?
  • What is the difference between a population and a sample?
  • What are different types of sampling methods?


Conceptual Guiding Questions

  • How can probabilities be used to make decisions about situations?
  • How can you compare two data distributions?
  • How do you use samples to draw inferences?
  • How can experimental and theoretical probabilities be used to determine if a game is fair?
  • How do the experimental and theoretical probabilities compare when you increase the number of trials in a game?
  • Based on the data, what do you predict/infer about this population?


Engaging/Debatable Guiding Questions

  • Which method would you use to find the theoretical probability for a given situation?
  • Which measure of center is appropriate for a given situation?
  • Were the ways in which the data were collected or analyzed likely to give results that represent the population? Why or why not?