Calculating Probability

Learn what probability means, how to calculate it, and how to estimate probability using experiments. Let’s get started! πŸš€

Calculating Probability - introduction visual

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Explanation of probability, including the likelihood of events happening and a scale ranging from impossible (0%) to certain (100%).Explaining probability of drawing a red ball from a bag of 10 balls (3 red, 7 blue) with a probability formula and example calculation.Drawing 100 times and getting 37 red and 63 blue. Explanation of experimental probability as estimated from outcomes compared to true probability.

πŸ›ŽοΈ What Is Probability?

  • Probability tells us how likely an event is to happen.
  • It is written from 0 to 1, or 0% to 100%.
  • 0% means impossible and 100% means certain.

πŸ›ŽοΈ Calculating Probability

  • Probability equals number of desired outcomes Γ· total number of outcomes.
  • For example, with 3 red balls out of 10 balls, the probability of red is 3/10 or 30%.

πŸ›ŽοΈ Experimental Probability

  • Experimental probability is used when the true probability is unknown.
  • You repeat an experiment to estimate how likely an event is.
  • The more trials you do, the closer it gets to the true probability.

Practice Questions

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Interactive Activity

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