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Expected outcomes use probability to predict how many times an event should occur over a number of trials. Students multiply probability by the number of trials and compare expected results with experimental data.
Our tutors see these errors again and again. Knowing them in advance gives you a head start.
Expecting experimental results to match theoretical probability exactly
Confusing expected frequency with actual frequency
Forgetting that expected outcomes can be non-whole numbers
This topic is tested by the following exam boards. Our tutors are specialists in each one.
Basic probability introduces the scale from 0 to 1 and the idea of equally likely outcomes. Students calculate probabilities of single events, understand mutually exclusive events, and work with the probability that something does not happen.
ProbabilityCombined events involve finding the probability of two or more things happening together or in sequence. Students use the addition rule for OR and the multiplication rule for AND, applying these to independent and dependent events.
StatisticsSampling methods determine how data is collected for a statistical investigation. Students must understand random, systematic and stratified sampling, and evaluate the strengths and limitations of each method.
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