Introduction to Probability

learning_notes

Last updated: 8/16/2025

Key Concepts:

  • Definition of Probability: Probability measures the likelihood of an event occurring and is expressed as a fraction, decimal, or percentage.
  • Basic Probability Formula: The probability of an event occurring is calculated as: (P(A) = \frac{\text{Number of favorable outcomes}}{\text{Total number of possible outcomes}})
  • Understanding Random Selection: Every outcome has an equal chance of being selected when choosing randomly.

Skills Covered:

  • Computing simple probabilities from a given dataset.
  • Expressing probability in different formats (fractions, decimals).

Example Problems:

  • A bag contains 4 red and 6 blue balls. What is the probability of randomly drawing a red ball?
  • If a six-sided die is rolled, what is the probability of getting a 4?

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