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Part of Expected Frequency — GCSE Mathematics

This exam tips covers Exam Tips 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 4 of 4 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.

Topic position

Section 4 of 4

Practice

14 questions

Recall

12 flashcards

Exam Tips

  • Use the formula - Expected frequency = Probability × Number of trials
  • Be clear about probability - use experimental or theoretical as appropriate
  • Round sensibly - you can't have 15.7 people, so round to 16
  • Show your working - write the probability and number of trials clearly
  • Check reasonableness - does your answer make sense?

Keep building this topic

Read this section alongside the surrounding pages in Expected Frequency. That gives you the full topic sequence instead of a single isolated revision point.

Calculating Expected FrequencyPredicting the FutureKey Facts

Practice Questions for Expected Frequency

Which formula correctly gives the expected frequency of an event?

  • A. Probability + Number of trials
  • B. Probability × Number of trials
  • C. Number of trials ÷ Probability
  • D. Probability ÷ Number of trials
1 markfoundation

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.

3 markshigher

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.

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