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 2 of 3

A 10% trimmed mean

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Twenty online orders had the following values (SAR):

396, 813, 221, 235, 131, 208, 367, 295, 358, 215, 321, 58, 92, 390, 368, 211, 202, 149, 209, 413

Calculate the 10% trimmed mean. Give it to 2 decimal places.