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10 cards from this deck
Position = 4/10 * 50 = 20th value on the graph.
Position = 36/100 * n, where n is total data values.
80th percentile is the 120th value in ordered data.
Position = 20/100 * total frequency.
Subtract 20th percentile value from 80th percentile value.
Position = 6/10 * 150 = 90th value on the graph.
A decile splits data into 10 equal parts.
The maximum is the 9th decile, not the 10th.
Draw horizontal to curve, then vertical to axis.
Decile position = d/10 * n, where d is decile number.
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