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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Application, difficulty 2 of 3

How good is the grouped estimate?

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Group commute_min from the commute dataset into the classes 0 to under 20, 20 to under 40, …, 140 to under 160 minutes. Estimate the mean from the grouped table, then calculate the exact mean from the raw values. Give both to 2 decimal places.

Data: commute · Open in the lab to explore and calculate.