[ Mathematics ] Open Question : Probability help???? best answer to the correct answer? I kinda understand it a lil' help?

HHHHHHEEEEEELLLPPP???? who wants to get best answer? suppose that 4.5% Percent of the people in the world have a particular genetic defect 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 correctly identified as having it?