Cumulative Churn Rate

Problem

Compute the cumulative churn rate from monthly churn rates: 1 - product(1 - rate_i). Empty input returns 0.0.

Hint

Churn compounds: surviving each month requires surviving every earlier month too.

case 1

in: [[0.1,0.1]]

expected: 0.18999999999999995

case 2

in: [[0.5,0.5]]

expected: 0.75

case 3

in: [[]]

expected: 0

case 4

in: [[1,0.2]]

expected: 1

Starter codePython

def cumulative_churn(monthly_churn_rates):
    # Your code here
    pass

4 test cases · run your code against them in the editor