Daily Practice

Foundation

10th June 2026

5 questions · Foundation tier · 282 questions in this band

1
Data Cleaning and Outliers (Foundation)
A shop records daily sales in pounds: 340, 355, 360, 348, 2, 352. Which value looks like a data entry error?
2
Correlation and Causation (Foundation)
A researcher finds that towns with more fire engines have more fire damage, and concludes that fire engines cause fire damage. Identify the flaw in this reasoning and suggest the true common cause.
3
Risk (Foundation)
Out of 200 people who ate a certain meal, 10 became ill. What is the risk of becoming ill, as a fraction in its simplest form?
4
Skewness by Inspection
Describe, using the mean and median, how you could tell that a distribution is positively skewed without drawing a graph.
5
Percentiles
A cumulative frequency graph shows that a value of 18 corresponds to a cumulative frequency of 45 out of 60 total data points. Find the percentile.

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