A pharmaceutical firm has discovered a new diagnostic test for a certain disease that has infected 1% of the population. The firm has announced that 95% of those infected will show a positive test result, while 98% of those not infected will show a negative test result. What proportion of test results are correct? Please answer to 4 decimal places.

What we have here is:

* 1% are infected

* 99% are NOT infected

We have to find two probabilities here:

(1) an infected person test shows positive result (correct result): (Let A)

It's 95% of 1% so, P(A) = 0.95 * 0.01 = 0.0095

(2) a person who is not infected shows a negative (correct) result in the test: (Let B)

It's 98% of 99% so, P(B) = 0.98 * 0.99 = 0.9702

So success rate would be P(A) + P(B) = 0.9702 + 0.0095 = 0.9797

answer: i guess 5 units?

step-by-step explanation:

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.