medium Data Visualisation

Score Distribution Histogram

The Brief

A teacher wants to see how exam scores are distributed across their class. Build a histogram showing the frequency of scores in 10-point bins, with the mean drawn as a vertical reference line. Print summary statistics alongside the chart.

Acceptance Criteria

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2 Use the provided list of scores

3 Print the mean median and standard deviation of the scores

5 Add a vertical line at the mean using plt.axvline

1 Set the matplotlib backend to Agg before importing pyplot

4 Create a histogram with 10-point bins from 0 to 100 using the bins parameter

6 Label the vertical line so it appears in the legend

7 Add a title and axis labels

8 Add a legend so the mean line is identified

9 Save as score_histogram.png

💡 Hints 0 / 3

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solution.py

Python 3

import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import statistics

scores = [42, 67, 71, 88, 55, 90, 73, 64, 81, 45,
          77, 58, 92, 69, 84, 51, 76, 60, 83, 48,
          72, 65, 79, 53, 87, 61, 74, 56, 89, 68]

# Print mean, median, std
# Create histogram with 10-point bins
# Add a vertical line at the mean
# Save as score_histogram.png

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