Print summary statistics

📂 Task: Display summary statistics for numerical columns in the dataset.
📌 File to modify: main.ipynb

✅ Expected Output:

Use df.describe() to show mean, std, min, etc.

Comment your findings for better understanding

Open main.ipynb, locate the dataset variable (likely `df`). Use `df.describe()` to generate summary statistics for numerical columns. Print the result and add a comment interpreting the output (e.g., noting the mean, spread, or outliers). Run the notebook cell to verify the output matches the expected format.

索引モデルが issue の本文から書いたものです。