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

Percentile rank

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Twenty applicants took an aptitude test. Their scores were:

75, 92, 81, 97, 74, 96, 45, 68, 65, 78, 41, 70, 69, 44, 43, 82, 87, 86, 42, 83

A new applicant scores 72.5. Compared with these twenty, what is the percentile rank of that score — the percentage of the twenty scores that are below it?