 HISTOGRAMSHISTOGRAMS Frequency histograms and polygons Same width.

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HISTOGRAMSHISTOGRAMS Frequency histograms and polygons Same width

Drawing a Frequency histogram and a polygon 1- Rule up a set of axes on graph paper 2- Title the graph 3- label the horizontal axis and the vertical axis (frequency) 4- leave a ½ unit or interval apace, draw in the first column 5- Draw in the columns for each of the other scores 6- Mark the midpoints of the tops of the columns obtained in the histogram 7- Join the midpoints by straight line intervals Maths Quest 9 5.2 Pathway

A histogram is a graph that uses the height of a column to show the frequency of each score. The scores are always placed on the horizontal axis, and the frequency on the vertical axis. A frequency polygon is a line graph obtained by joining the midpoints of the tops of the columns of a histogram. New Century Maths

1- Rule up a set of axes on graph paper 2- Title the graph 3- label the horizontal axis and the vertical axis (frequency) 4- leave a ½ unit or interval apace, draw in the first column 5- Draw in the columns for each of the other scores 6- Mark the midpoints of the tops of the columns obtained in the histogram 7- Join the midpoints by straight line intervals

Features of a histogram A space (equal to half the column width) is left between the vertical (frequency) axis and the first column. Each column must be the same width. No gasps are allowed between columns. The label for each score is placed under the centre of its column, on the horizontal axis.