Daily Practice

Foundation

8th March 2026

5 questions · Foundation tier · 282 questions in this band

1
Data Cleaning and Outliers (Foundation)
The heights (cm) of 6 plants are: 15, 18, 16, 14, 17, 150. Find the mean of the remaining values after removing the outlier.
2
Correlation and Causation (Foundation)
Define correlation in your own words.
3
Risk (Foundation)
Out of 600 drivers who used a phone while driving, 24 had an accident that year, compared with 9 out of 900 drivers who did not use a phone. Calculate the risk of an accident for each group.
4
Skewness by Inspection
A distribution has mean = mode = median. What does this suggest about its shape?
5
Percentiles
Which percentile is the same as the median?

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