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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Challenge, difficulty 2 of 3

One extreme value

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Nine employees' commutes (minutes) are 36, 26, 30, 24, 26, 36, 29, 29, 30. A tenth employee joins whose commute is 140 minutes.

By how many minutes does the mean increase, and by how many does the median increase? Give both to 2 decimal places.