Unit 4 · Probability

Chapter 4.2

Probability One Step at a Time

When a random process unfolds in stages, you can follow it one step at a time instead of counting everything at the end.

free · lesson 20 of 42

By the end

  1. 01Multiply probabilities along a path of stages and add over separate paths
  2. 02Condition on what has already happened
  3. 03Set up equations for a process that can return to an earlier state

In unit 4

  1. 4.1Fix the Sample Space First
  2. 4.2Probability One Step at a Time
  3. 4.3Geometric Probability and Expected Value
  4. 4.4Which Idea Opens It? Counting and Probability
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