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% winsorized mean

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A fitness app recorded 20 users' average heart rate during a workout session (bpm):

68, 62, 64, 58, 80, 70, 152, 10, 64, 69, 63, 68, 63, 66, 55, 59, 62, 55, 62, 63

Some readings look like sensor glitches. Calculate the 10% winsorized mean to 2 decimal places.