import pandas as pd

# create a sample dataframe
data = {'Cat': ['A', 'A', 'B', 'B', 'B', 'C'],
 'Value': [10, 20, 30, 40, 50, 60]}
df = pd.DataFrame(data)

# compute the mean of each category
mean = df.groupby('Cat')['Value'].mean().reset_index(name='Mean')

print(mean)