PSAT Math Multiple-Choice Practice Question 575

Question: 575

300 patients at a hospital were categorized based on whether they had high or low cholesterol and on whether they had high or low blood pressure. The results are tabulated in the table below.
High Cholesterol
Low Cholesterol
Total
High Blood Pressure
40
30
70
Low Blood Pressure
50
180
230
Total
90
210
300

What is the probability that one of the 230 low blood pressure patients has high cholesterol?

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