Question

Question 116 (ii)

Health Application A doctor reports blood pressure in millimetres of mercury (mm Hg) as a ratio of systolic blood pressure to diastolic blood pressure (such as 140 over 80). Systolic pressure is measured when the heart beats and diastolic pressure is measured when it rests. Refer to the table of blood pressure ranges for adults.
Manohar is a healthy 37 yr old man whose blood pressure is in the normal category.
If Manohar's systolic blood pressure is 102 mm Hg, then use the ratio from part (a) to predict his diastolic blood pressure.

Answer 1

Manohar's systolic blood pressure =102 mm Hg
Let diastolic blood pressure = x mm Hg
According to the question, $\frac{Systolicbloodpressure}{Diastolicbloodpressure}=\frac{3}{2}$ [from part (a)]
$\Rightarrow \frac{102}{x}=\frac{3}{2}\Rightarrow x=\frac{102\times 2}{3}\therefore x=68mmHg$
Hence, Manohar's diaslolic blood pressure is 68 mm Hg.