Daily Practice

Foundation

11th September 2025

5 questions · Foundation tier · 282 questions in this band

1
Skewness by Inspection
A distribution has a long tail of high values on the right. What type of skew is this?
2
Percentiles
In a class of 30 students, a student's mark is at the 90th percentile. Roughly how many students scored less than or equal to that mark?
3
Crude Rate and Rates of Change
A region records 90 crimes in a population of 45,000. Find the crude crime rate per 1000 people.
4
Spearman's Rank Interpretation
For a class, the Spearman's rank correlation coefficient between shoe size and spelling test score is rs = 0.15. Describe the correlation.
5
Conditional Probability (Foundation)
A bag has 3 red, 4 green and 5 blue balls (12 total). One ball is removed at random and is blue. A second ball is then removed. Find P(second ball is red given the first ball was blue).

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