✏️ Practice Exercises

Statistics

3 problems · Easy to Hard · Type your working · AI checks your steps

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How to use these exercises

Read the question → work it out step-by-step in the box → click Check My Working to get AI feedback. Use hints if stuck. Reveal the full solution only after you have tried.

01

easy

Mean of 4, 8, 6, 10, 12:

💡 Show hint

Sum ÷ count.

Your Working

02

medium

Median of 23, 17, 19, 25, 14, 21, 18:

💡 Show hint

Sort first.

Your Working

03

hard

Standard deviation of 2, 4, 4, 4, 5, 5, 7, 9:

💡 Show hint

Find mean first, then √(mean of squared deviations).

Your Working

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