Answer:
The probability that a randomly chosen person test positive is 0.06325
Explanation:
Let T denotes the test and D denotes the disease
We are given that The test to detect the presence of strep throat is 98% accurate for a person who has a disease

We are also given that 97% accurate for person who does not have the disease.
So,

Now we are given that 3.5% of the people in a given population actually have strep throat,
So,P(D)=0.035



Now we find :


Hence the probability that a randomly chosen person test positive is 0.06325