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 have an irregular heartbeat.
What portion of the patients selected have a regular heartbeat and low blood pressure?