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A doctor is studying the relationship between blood pressure and heartbeat abnormalities in her patients. She tests a random sample of her patients and notes their blood pressures (high, low, or normal) and their heartbeats (regular or irregular). She finds that:
i) 14% have high blood pressure
ii) 22% have low blood pressure
iii) 15% have an irregular heartbeat
iv) Of those with an irregular heartbeat. One-third have high blood pressure
v) Of those with normal blood pressure, one-eighth has an irregular heartbeat.
What portion of the patients selected has a regular heartbeat and low blood pressure?
A) 2% B) 5% C) 8% D) 9% E) 20%
Sagot :
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