Statistics Quest

Practice

Practise until it sticks

Choose a topic, a skill or a difficulty. Calculation exercises have new versions with fresh numbers once you have solved them, so you can practise the method rather than memorise an answer.

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Practice, difficulty 1 of 3

Exact or estimated?

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A grouped table gives the number of households in each monthly income band (with closed bands only). Sort each quantity by what the table allows.

The total number of households
The percentage of households below a band boundary
The mean income
The median income
The single highest household income
The modal class (the band with the most households, when bands have equal widths)