Please help me with question. I'm confused.

a new screening for breast cancer is being tested on 1200 volunteers. Among the volunteers, 20% have breast cancer. The sent ivory is 78% and specificity is 90% for the screening. What s the number of true positives that were screened positives ? What is the number of true negatives that were screened negative?
Joe0590
Joe0590
Asked May 07, 2015
Edited May 07, 2015
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