# Remove listings with mileage = 0.
directowner_df = directowner_df[directowner_df['Mileage'] != 0]
dealer_df = dealer_df[dealer_df['Mileage'] != 0]

# Rerun the descriptive statistics.
desc_directowner = directowner_df.describe()
desc_dealer = dealer_df.describe()

# Plot histogram for direct vs non-direct owner sales.
sns.distplot(directowner_df['Mileage'], label='Direct Owner', color='red', bins=50, kde=True)
sns.distplot(dealer_df['Mileage'], label='Dealer', color='mediumblue', bins=50, kde=True)
plt.title('Mileage (in km) - Direct Owner vs Dealer Sales')
plt.legend()
plt.show()