Year 9 / Grade 9 • Daily Maths Drill
Statistics and Probability
Interpret samples, distributions and compound probability.
8 questions • 240-question rotating bank • 30 different sets before a full cycle repeats
8Questions
240Question bank
0Best score
💡 Quick Review
Statistics and Probability
Judge whether samples are representative and use probability rules appropriate to the situation.
Key ideas
- sampling
- bias
- centre/spread
- compound events
- relative frequency
Worked example: independent two-stage probabilities multiply.
Common trap: A random-looking sample is not automatically representative.
Key words
bias — systematic favouring of outcomes
sample — subset
population — full group
compound event — event with multiple stages
relative frequency — observed proportion
How to use this drill: review the short notes when learning, then close them on later attempts and practise from memory. The rotating bank delays a full set repeat for 30 attempts on the same browser.