Probability in spinner or bag contexts
This is probability applied to a spinner or a bag where each sector or item may represent an outcome.
Practice This ConceptMain explanation
Teacher explanation
In spinner questions, equal sectors mean equal chance. In bag questions, the count of each colour or type decides the probability. These problems are common because they connect direct counting with a visual model that students can understand quickly.
Example
If a spinner has 5 equal parts and 2 are blue, the probability of blue is 2/5.
Simple analogy
Count the marked parts, then divide by all equal parts.
Common confusion
Students sometimes count colours or sectors without checking whether they are equal in size.
Exam tip
For spinners, check equal parts. For bags, count the exact number of items of each type.
Answer writing and exam use
1-mark use
Write the exact meaning of probability in spinner or bag contexts in one clean line.
2-mark use
Define probability in spinner or bag contexts and add one example or condition.
3-mark use
Explain probability in spinner or bag contexts, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
Open the concept quiz intro first, review the test details, and then start a focused MCQ set from this concept only. Instant score and answer review are live now.
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