Exponential PDF Value

Problem

The exponential density with rate lambda is lambda * exp(-lambda x) for x >= 0 and 0 otherwise.

Given x and the rate, return the density.

Hint

The density is largest at zero.

case 1

in: [1,2]

expected: 0.2706705664732254

case 2

in: [0,0.5]

expected: 0.5

case 3

in: [-1,1]

expected: 0

Starter codePython

def exponential_pdf_value(x, rate):
    # Your code here
    pass

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