hi

in the attachment is the question

I have problem solving it

from question I just knew the Prior Probability for that their claim correct is =0.2 and not correct =0.8

after he did the experiment he found that it is correct 100 %

but I could not find where is the posterior

Prior Probability =0.2

correcting information= 1

posterior =?

until now this is what I came up with

thank you in advance