Statistics Quest

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

Does the empirical rule hold?

Not started

For exam_score in the student_scores dataset (400 students), what percentage of students have a score within one standard deviation of the mean, and what percentage within two standard deviations? Use the sample SD and count a score exactly on the boundary as within. Give both to 1 decimal place.

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