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Ontario MTH1W · Data · D1.2

Represent and analyse one-variable data

Describe a distribution using its centre, spread, shape, and unusual values.

The core idea

One-variable data records one characteristic for each case. A useful description goes beyond one average: it considers a measure of centre together with spread and the distribution’s shape.

Learning example

Find the median and range

For 3, 5, 5, 7, 10, find the median and range.

  1. 1

    The values are already ordered. The middle value is 5, so the median is 5.

  2. 2

    The maximum is 10 and the minimum is 3.

  3. 3

    Range = 10 − 3 = 7.

AnswerMedian 5; range 7.

A common mistake

Dividing the largest value by the smallest to find range. Range is a difference: maximum minus minimum.

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