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 without the defect who are identified as having it?

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 without the defect who are identified as having it?

anonymous · Answer

I know this question was asked a year ago and I'm pretty sure you're in a new grade, but I'm still going to put the answer for people who may look this up:

The answer is 11.