The cards Question In probability, what is a trial? Tap to flip Answer A single predefined test. Question What can go wrong when possible outcomes are listed in an unsystematic way? Tap to flip Answer Outcomes may be missed or repeated. Question What is the probability that an event will occur? Tap to flip Answer The proportion of times the event is expected to happen in a suitably large experiment. Question What is probability a measure of? Tap to flip Answer The likelihood of an outcome happening. Question Between which values can the probability of an outcome lie? Tap to flip Answer From 0 to 1. Question Which probabilities match 'likely' on the scale of likelihoods? Tap to flip Answer All probabilities greater than 50% but less than 100%. Question What is a theoretical probability based on? Tap to flip Answer Counting the desired outcomes from a sample space where all individual outcomes are equally likely. Question Why might picking a sweet from a box of differently shaped sweets not be random? Tap to flip Answer Someone could find their favourite flavour by feeling the different shapes. Question What is frequency? Tap to flip Answer The number of times an event occurs, or the number of individuals with some specific property. Question When finding a probability from a frequency table, what should the denominator be? Tap to flip Answer The total frequency, not the number of different categories. Question What does each branch of a probability tree show? Tap to flip Answer A possible outcome from an event or stage of a trial, with the probability of that outcome happening. Question How many branches can a layer of a probability tree have? Tap to flip Answer Any number, though more branches make the tree trickier and less practical to draw and use. Question Can a probability be 3? Tap to flip Answer No. The probability scale is between 0 and 1. Question In a Venn diagram, what is commonly used to represent events? Tap to flip Answer Circles. Question What are Venn diagrams very useful for in probability? Tap to flip Answer Categorising already known outcomes into events, which can then be used to calculate probabilities. Question Are Venn diagrams as useful for generating a list of outcomes? Tap to flip Answer No, they are not as useful for generating a list of outcomes. Question When are two events mutually exclusive? Tap to flip Answer When they share no common outcome. Question What do the probabilities of all possible unique outcomes for a trial sum to? Tap to flip Answer 1 Question Does summing the probabilities of non-unique events give 1? Tap to flip Answer No, it gives a value not equal to 1. Question When do probabilities of events sum to 1? Tap to flip Answer When the events are mutually exclusive and exhaustive. Question On a six-sided dice, why do P(multiple of 6) and P(factor of 6) not sum to 1? Tap to flip Answer The outcome 6 is counted twice. Question How can the fact that all unique outcomes' probabilities sum to 1 be used? Tap to flip Answer To find unknown probabilities. Question When finding the probability of A or B, what mistake is common? Tap to flip Answer Counting the outcomes that belong to both A and B twice. Question In a probability tree for a two-stage trial, how is an outcome's probability found? Tap to flip Answer Multiply the probabilities of the outcomes at each stage. Question How is the probability of an event found from its outcomes? Tap to flip Answer Add the probabilities of each outcome in the event. Question In probability, what is an event? Tap to flip Answer A subset of a sample space: an outcome or set of outcomes that may occur from a trial. Question Is the probability of an event the product of the probabilities of its outcomes? Tap to flip Answer No, it is the sum of the probabilities of each outcome in the event. Question Why might theoretical probabilities not be seen in the short term? Tap to flip Answer They come from long-term behaviour. Question To increase a probability by 50%, what do you multiply it by? Tap to flip Answer 1.5 Where this deck sits in the curriculum Curriculum National Curriculum for England Stage Key stage 3 (Years 7–9) Course KS3 Maths Unit Probability: theoretical probabilities England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-03, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
Sources Total: 12 · primary: 12 · second publisher: 0
Show the other sources (10) Primary source Comparing multiple representations to calculate theoretical probabilities for combined events (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Problem solving with theoretical probability (opens in a new tab) (Oak National Academy, thenational.academy) Primary source The probability scale (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Calculating theoretical probabilities from lists (one event) (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Calculating theoretical probabilities from a table (one event) (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Calculating theoretical probabilities from probability tree diagrams (one event) (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Calculating theoretical probabilities from Venn diagrams (one event) (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Comparing multiple representations to calculate theoretical probabilities (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Summing probabilities (opens in a new tab) (Oak National Academy, thenational.academy) Primary source Calculating theoretical probabilities from two-way tables (two events) (opens in a new tab) (Oak National Academy, thenational.academy) Found a mistake? Write to support@flashfeed.app .
A Maths lesson by Oak National Academy licensed under Open Government Licence (OGL)
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