Bathtub Hazard

Problem

Bathtub-shaped hazard rate with infant-mortality, constant and wear-out components:

h(t) = a / t + b + c * t for t > 0.

Return 0.0 for t <= 0 or negative coefficients.

Hint

The three terms capture early failures, random failures and wear-out.

case 1

in: [1,0.1,0.2,0.3]

expected: 0.6000000000000001

case 2

in: [2,0.2,0,0.1]

expected: 0.30000000000000004

case 3

in: [0,1,1,1]

expected: 0

case 4

in: [1,0,1,0]

expected: 1

Starter codePython

def bathtub_hazard(t, a, b, c):
    # Your code here
    pass

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