This key facts covers Key Facts within Expected Frequency for GCSE Mathematics. Revise Expected Frequency in Probability for GCSE Mathematics with 14 exam-style questions and 12 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 5 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Key Facts
- Expected Frequency = Probability × Number of trials
- Tells us what we would expect to happen on average
- Actual results may differ from expected results
- The more trials, the closer actual results get to expected results
- Used in business planning, quality control, and decision making
- Can be used with any probability (experimental or theoretical)
Practice questions for Expected Frequency
Which formula correctly gives the expected frequency of an event?
A fair coin is flipped 50 times. The expected number of heads is 25. In the actual experiment, only 18 heads are recorded. Explain why the actual number of heads may differ from the expected number of heads.
Quick recall flashcards
What is relative frequency?
Relative frequency = frequency of event / total number of trials. It is also called experimental probability.
What is expected frequency?
The number of times we would expect an event to occur in a given number of trials, based on its theoretical probability.