In a class-test in which 135 candidates were examined for proficiency in English and Economics, it was discovered that 75 students failed in English, 90 failed in Economics, and 50 failed in both....

Extracted text: In a class-test in which 135 candidates were examined for proficiency in English and Economics, it was discovered that 75 students failed in English, 90 failed in Economics, and 50 failed in both. Find if there is any association between failing in English and Economics and also state the magnitude of association.