Question

The incidence of breast cancer varies depending on a woman's age. The National Cancer Institute gives the following probabilities for a randomly chosen woman in her 40s who takes a mammography to screen for breast cancer 0.8 Positive 0.2 Negative Postive 0.9 Negative Cancer 0.0149 0.9851 No cancer A true positive happens when someone getting a mammography has cancer and recelves a positive test result. What percent of women in their 40s taking a screening mammography receive a true positive? Answer 1.0: 80% 2.D 11% 3.) 1096 4,0 1%

Answer 1

Answer 2

(0.0149x0.8)/((0.0149x0.8)+(0.9851x0.1) = 0.1079

Answer is  2. 11%