Below is the probability distribution for the number of times students had to take the same exam before passing it.If a student must pass the exam in two tries of less to pass the class,then what is the probability of passing the class?
A).80
B).40
C).20
D).10

Question

Below is the probability distribution for the number of times students had to take the same exam before passing it.If a student must pass the exam in two tries of less to pass the class,then what is the probability of passing the class? 
A).80 
B).40 
C).20 
D).10

Quizplus · Accepted Answer

According to the problem statement, a student must pass the exam in two tries or less to pass the class. Looking at the probability distribution, we can see that the probability of passing the exam on the first try is 0.5 and the probability of passing on the second try is 0.3. Therefore, the probability of passing within two tries is the sum of these probabilities, which is 0.5 + 0.3 = 0.8 or 80%. Therefore, the correct answer is A) .80.

Below Is the Probability Distribution for the Number of Times