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estimate histogram
median height
histogram
estimate
height
median
children
represent
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Histograms

Using a histogram to estimate the median

Slide2Mark

0 –20

20 –3030 –3535 –4545 –5555 –70Frequency91220292723

Example The distribution below represents the examination marks of 120 students.

Draw a histogram to represent the data

Use the histogram to estimate the median

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Slide3Height (cm)

Frequency

130 – 135 5135 – 140 7140 – 150 15150 – 160 29160 – 165 13165 – 170 10

170 – 175 1

Example

The following table gives the heights of 80 children.

Draw a histogram to represent this information.

Using the histogram estimate the height by which 20% of the children exceed.

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