Question

Suppose that 4.5% of the people in the world have a particular genetic defect and that a screening test is 81% accurate for people who have it and 88% accurate for people who do not.. . If 1300 people are screened for the defect, which is the best prediction for the number of people with the defect who are identified as not having it?. . a. 11. . b. 16. . c. 48. . d. 59. Please explain too! I don't get it!!!

Answer 1

Most of the information's required for answering this question is already given.
Percentage of people in the world having genetic defects = 4.5%
Total number of people screened = 1300
Number of people having defect = 1300 * (4.5/100)
= 58.5
The number of people having the defect
but diagnosed wrongly not to have it = 58.5 * (19/100)
= 11
From the above deduction, we can conclude that the correct option among all the options that are given in the question is the first option or option "a". I hope that the procedure is clear enough for you to understand.