Giving if the standard deviation of a population increases, what else must necessarily increase? (1 point) the population's mean the population's median the population's mode the population's variance

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%