probability of answering correctly 0.8 if ans. not known....

[crb123]

please see the attached image...and see if the table is filled correctly ..any help will be highly appreciated.....thank you

 

[tkhunny]

Where did you get p(c|k)?

It appears you have the student simply guessing, even when the answer is known. I find that hard to believe.

p(c|k) should be a very high value, nearly unity.