This deep dive covers Calculating Expected Frequency 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 3 of 4 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 3 of 4
Practice
14 questions
Recall
12 flashcards
Calculating Expected Frequency
Formula
Expected Frequency = Probability × Number of trials
Example 1: Coin Flipping
If you flip a coin 200 times, how many heads do you expect?
Expected heads = P(heads) × Number of flips = 0.5 × 200 = 100
Example 2: Quality Control
A factory knows that 3% of its products are defective. In a batch of 500 items, how many defects are expected?
Expected defects = P(defective) × Number of items = 0.03 × 500 = 15
Using Experimental Probability
A basketball player has made 15 out of 25 free throws in practice. If they take 40 free throws in a game, how many do we expect them to make?
Experimental probability = 15/25 = 0.6
Expected makes = 0.6 × 40 = 24