Last updated on Oct 23, 2026

Practice Problems (Junior Cert Mathematics): Quizzes

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What does the mean tell you about a dataset?

The average value

Find the mean of: $30, 45, 35, 50, 40, 60, 55$

$45$ minutes

What is the median of a dataset?

The middle value when ordered

Find the median of: $72, 85, 78, 90, 68, 95, 88$

$85$

What does the mode represent?

The most frequent value

Find the mode of: $20, 22, 22, 25, 20, 19, 22$

$22$ items

How do you calculate the range?

Highest minus lowest value

Find the range of: $5, 12, 0, 8, 15$

$15$ minutes

What does Q1 (first quartile) represent?

Median of the lower half

For data $1, 3, 5, 7, 9, 10, 12, 15$ , what is Q1?

$4$

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