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To plot a cumulative frequency diagram, the cumulative frequency is always plotted along the vertical axis and data are always plotted at the top range of the interval: for example, frequency for weekly salary ranges £100150 and £151200 would be plotted at 150 and 200.
Green stands for agriculture. Red recalls the struggle for independence. White denotes peace. Yellow symbolizes mineral wealth. Effective date: April 1983.
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