Item Difficulty Index

Problem

Return the item difficulty index correct/n, the proportion of examinees answering correctly. Return 0.0 when n <= 0.

Hint

This p-value is the classical item facility index.

case 1

in: [15,20]

expected: 0.75

case 2

in: [0,10]

expected: 0

case 3

in: [20,20]

expected: 1

case 4

in: [5,0]

expected: 0

case 5

in: [1,3]

expected: 0.3333333333333333

Starter codePython

def item_difficulty_index(correct, n):
    # Your code here
    pass

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