A professor gives a true-false examination consisting of thirty T-F questions. The questions whose answers are "true" are randomly distributed among the thirty questions. The professor thinks that 3/aof the class are serious, and have correctly mastered the material, and that the probability of a correct answer on any question from such students is 75%. The remaining students will answer at random. She glances at a couple of questions from a test picked haphazardly. Both questions are answered correctly. What is the probability that this is the test of a serious student?

Question

anonymous · Answer

what is 75% of 30 agian (dont have calculator of hand)

anonymous · Answer

22.5

anonymous · Answer

I am not sure sorry. But you could say that it is possible that the test is from a "serious student" because you are asked for the possibility which means that it doesnt have to be a percentage.  hope this helps

kropot72 · Answer

@7mada2010 There is a typo in this part of your question; "The professor thinks that 3/aof the class are serious". Please check the original question and post a correction.

usukidoll · Answer

3 out of the class?

anonymous · Answer

oh i'm sorry i mean 3/4 class

usukidoll · Answer

75%

anonymous · Answer

A professor gives a true-false examination consisting of thirty T-F questions. The questions whose answers are "true" are randomly distributed among the thirty questions. The professor thinks that 3/4 of the class are serious, and have correctly mastered the material, and that the probability of a correct answer on any question from such students is 75%. The remaining students will answer at random. She glances at a couple of questions from a test picked haphazardly. Both questions are answered correctly. What is the probability that this is the test of a serious student?

anonymous · Answer

anonymous · Answer

thanks for your help