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Introduction
Churned customers
Customer retention charts
Summary
11. Question 2

## Instruction

Good job! One more question to go.

## Exercise

Create a customer retention chart in weekly signup cohorts. It should have the following columns:

• Year
• Week
• PercentActive10d (the percentage of customers still active 10 days after their registration)
• PercentActive30d (the percentage of customers still active 30 days after their registration)
• PercentActive60d (the percentage of customers still active 60 days after their registration)

Order the results by year and week.