Clean excel data in attached file named BUHI Customer Data. The U.S. demographics data will help you replace missing cells within the customer data. 

Interpolate missing data using the estimated values from the U.S. demographics dataset based on the customers’ zip codes
Remove extreme outliers
Correct incorrect value formats (e.g., age = twelve instead of 12)
Remove impossible values (e.g., age = 203)
Identify categories from granular data (e.g., determine the state to which a zip code belongs)
Identify problem data with complex problems (e.g., the state is Montana, but the country is Canada; the purchase was $100, but the item is a new car; one column says the gender is female, but another says it is male)