Sarah has gone to work for 60 days. On 29 of those days, she arrived at work before 7:30 A. M. On the rest of the days she arrived after 7:30 A. M. What is the experimental probability she will arrive after 7:30 A. M. on the next day she goes to work ?

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%