Probability and Statistics

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Probability Rules and Expected Values

Probability and Statistics Probability Rules and Expected Values

🎬 Video Tutorial

  • Equiprobable events: events that have the same chance of happening
  • Addition rule for probability: calculate the probability of one event or another happening (when events are mutually exclusive)
  • Expected absolute frequency: estimate how often an event will occur over multiple trials, understanding that “expected” frequency is an estimation and actual results may vary

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📂 Revision Cards

Explanation of equiprobable events by using a die and showing that each face has an equal probability of 1/6.
Drawing coloured balls from a bag with 50 balls, showing 50% for blue and 30% for red.
Explanation of the probability of drawing blue or red balls from a bag with 50 balls using the addition rule for mutually exclusive events.
Calculating the expected absolute frequency using a die, illustrating that the expected absolute frequency of rolling a "3" over 60 trials is 10.

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