i don’t have a question i just want to say happy halloween at 1am because i’m a bit sad for no apparent reason right now so i just wanted to say happy halloween, i’m going to go to bed!

100,000 random people were tested for condition a. roberto's doctor told him he tested positive for condition a. if the test is 99% accurate and condition a is rare—one out of every thousand people have it. what is the probability that testing positive means roberto has condition a? 99.0% 1% 9% 99.9%