Answer and Explanation:
1.We have to ensure that data is being received from a reliable source
2.The wrong data would lead to wrong interpretation and prediction of customer's needs
3. The data mining algorithm must be effective enough to clean data that has alot of errors
4.incoporating background knowledge of the data in reducing complexity and finding data pattern
5. Data privacy and security issues present the challenge of getting needed data from data sources or resorting to other means that mayalr data less reliable