On a scale of 1-3, 1 being least valuable and 3 being most valuable, can you classify customers based on order frequency? For example, a customer who has made 10 purchases is more valuable than one that has made 2 purchases across the same time period. You can download the data here. For more information regarding customer lifetime value you can read this post. The solution will be provided to premium subscribers in Python. Note that this question is a part of a series of questions that will build off of each other.