Conditional Probability Table 2x2

Problem

A 2x2 table of joint counts is laid out as [[a, b], [c, d]]. Return the conditional probability P(row 0 | column 0) = a / (a + c).

Return 0.0 when a + c is 0.

Hint

Condition on the column total, not the grand total.

case 1

in: [[[10,5],[10,15]]]

expected: 0.5

case 2

in: [[[1,2],[3,4]]]

expected: 0.25

case 3

in: [[[0,1],[0,2]]]

expected: 0

case 4

in: [[[6,2],[3,9]]]

expected: 0.6666666666666666

Starter codePython

def conditional_probability_table_2x2(table):
    # Your code here
    pass

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