Answer:
P(Success)=1/4
and P(Failure)=3/4
Step-by-step explanation:
It is given that:
Laila guesses on all 20 questions of a multiple-choice test.
each question has 4 answer choices.
Now, we are asked to find the probability of a success as well as failure.
We know that a success is obtained when Laila correctly answers the question and a failure is obtained when she wrongly answers the question.
The success means that she marks the correct answer and failure means she marks the wrong answer.
Hence, for each question we have one correct choice and 3 incorrect choice.
Hence,
P( success)=1/4
and
P(failure)=3/4
