Tutorial Of the shirts in Vivian's dresser, 1/2 are striped, while another 1/3 are plaid. What fraction of
the shirts are either striped or plaid?
Write your answer as a fraction or as a whole or mixed number.
of the shirts
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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%