In an exam, there is a problem that 60% of students know the correct answer. however, there is 15% chance that a student picked the wrong answer even if he/she knows the right answer. and there is also a 25% chance that a student does not know the right answer but guessed it correctly. a. what is the probability that a student knows the right answer and gets it right? b. what is the probability a student doesn’t know the right answer and gets it right?