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38 lines
992 B
Python
38 lines
992 B
Python
6 years ago
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"""
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Histogram: a diagram consisting of rectangles whose area is proportional to the frequency
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of a variable and whose width is equal to the class interval.
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"""
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from collections import Counter
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from matplotlib import pyplot as plt
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grades = [83, 95, 91, 87, 70, 0, 85, 82, 100, 67, 73, 77, 0]
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def decile(grade: int) -> int:
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"""Returns the decile the grade falls into.
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Floor division must be used.
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"""
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return grade // 10 * 10
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histogram = Counter(decile(grade) for grade in grades)
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# Note We do not need to use the alignment tricks to center our bars
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# That was a hold over from the previous Matplob lib API
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plt.bar(x=histogram.keys(), height=histogram.values(), width=8)
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# Used to set the axis scale x-min, x-max, y-min, y-max
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# We want to fully show the x axis
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# You usually always want your y to start at 0
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plt.axis([-5, 105, 0, 5])
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plt.xticks(range(0, 110, 10))
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plt.xlabel("Decile")
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plt.ylabel("# of Students")
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plt.title("Distribution of Exam 1 Grades")
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plt.show()
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