You study for an exam, but due to the fact that you waited too long, you only learn 60% of the material. The exam is all multiple choice, with each question having 5 choices.

a) If you come across a question for which you don't know the answer, what's the probability of getting the answer right?

b) If you come across a question for which you do know the answer, what's the probability of getting it right?

c) What is the overall probability of getting any question correct?

Question

Krish White

Mathematics

16 August, 20:07

You study for an exam, but due to the fact that you waited too long, you only learn 60% of the material. The exam is all multiple choice, with each question having 5 choices.

a) If you come across a question for which you don't know the answer, what's the probability of getting the answer right?

b) If you come across a question for which you do know the answer, what's the probability of getting it right?

c) What is the overall probability of getting any question correct?

+3

Answers (1)

Know the Answer?

Fatty · Answer 1

A} The probability of getting a write answer of a question which you don't know the answer is 0.40*0.20 = 0.08 or 8%.

b} The probability of getting a write answer of a question which you know the answer is 0.6*0.20=0.12 or 12%.

c) The probability of getting a write answer is 0.20 or 20%.