Question

The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 120 and standard deviation of 18 . Someone qualifies as having Stage 2 high blood pressure if their systolic blood pressure is 160 or higher. a. Around what percentage of adults in the USA have stage 2 high blood pressure

Answer 1

The percentage of adults in the USA have stage 2 high blood pressure=98.679%

Explanation:

We are given that

Mean,
`\mu=120`

Standard deviation,
`\sigma=18`

We have to find percentage of adults in the USA have stage 2 high blood pressure.

`P(x\geq 160)=P(Z\geq (160-120)/(18))`

`P(x\geq 160)=P(Z\geq (40)/(18))`

`P(x\geq 160)=P(Z\geq 2.22)`

`P(x\geq 160)=1-P(Z\leq 2.22`

`P(x\geq 160)=0.98679`

`P(x\geq 160)=98.679`%

Hence, the percentage of adults in the USA have stage 2 high blood pressure=98.679%