9. Diastolic blood pressure tends to increase linearly with age. Suppose that the average diastolic blood pressure of 20-year-olds is 120 and the average diastolic blood pressure of 60-year-olds is 140. Given this model, what would be the average diastolic blood pressure of 50-year-olds?

Answer and Explanation

Your Answer is

Correct Answer is D

Explanation

From the question, it can be known that if the blood pressure has increased by 20 in 40 years, it will increase by 0.5 units per year. 120+0.5×(50-20)135, so choose D