Answer :
1/6
To find the probability you do no. expected to pass/total no. This is 100/120 which simplified is 5/6. Since we are finding the probability of failing, we do 1-5/6 =1/6.
To find the probability you do no. expected to pass/total no. This is 100/120 which simplified is 5/6. Since we are finding the probability of failing, we do 1-5/6 =1/6.