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Standard deviations - interactive illustration

The following interactive illustrates standard deviations for two very different classes. One class has a standard deviation of 10, while the other a standard deviation of 20. Click on the buttons to see the effect this has on the spread of results.

Large/Small Standard Deviation

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Class A: Median = 50, StdDev = 20
68% of the students lie within one standard deviation, that is approx 2/3 of all students obtained a mark between 30 and 70%. 95% of the students lie withing 2 standard deviations and therefore obtained marks between 10 and 90%.