Probability and Conditional Probability

SAT Math· difficulty 5/5

A medical test has the table: Disease (D) — Positive: 90, Negative: 10. No Disease (ND) — Positive: 50, Negative: 850. If a person tests positive, what is the probability they actually have the disease?

A
$90/140$
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B
$90/950$
C
$90/1000$
D
$90/100$

Explanation

90 + 50 = 140

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