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以下程式碼源自於ChatGPT，主要變數說明如下：
n_students：學生人數
n_exams：考試科目數
mean：考試成績平均數
std_dev：考試成績標準差

import pandas as pd
import numpy as np

# Set the number of students and the number of exams
n_students = 20
n_exams = 5

# Set the mean and standard deviation for the normal distribution
mean = 70
std_dev = 10

# Generate the random scores using numpy
scores = np.random.normal(loc=mean, scale=std_dev, size=(n_students, n_exams))

# Create a pandas DataFrame to store the scores
df = pd.DataFrame(scores)

# Set the column names
df.columns = ['Exam ' + str(i+1) for i in range(n_exams)]

# Set the row names as the student IDs
df.index = ['Student ' + str(i+1) for i in range(n_students)]

# Print the DataFrame
print(df)