When a needle biopsy is ordered, there is an 85 percent chance that the test will indicate no breast cancer. In a given week, 20,000 such tests are performed. Find the quartiles for the number of such...

When a needle biopsy is ordered, there is an 85 percent chance that the test will indicate no breast cancer. In a given week, 20,000 such tests are performed. Find the quartiles for the number of such biopsies that will indicate no cancer. Explain fully and show all steps. (Data are from The Economist Technology Quarterly 367, no. 8329 [June 21, 2003], p. 8.)