Answer: 4.27% of adults in the USA have stage 2 high blood pressure.
Explanation:
Let x be a random variable that denotes a person with high blood pressure .
Given: Average blood pressure:

Standard deviation:

Someone qualifies as having Stage 2 high blood pressure if their systolic blood pressure is 160 or higher.
The probability that an adult in the USA have stage 2 high blood pressure:
![P(x\geq160)=P((x-\mu)/(\sigma)}\geq(160-122)/(22))\\\\=P(z\geq1.72)\ \ \ [z=(x-\mu)/(\sigma)]\\\\=1-P(z<1.72)\\\\=1-0.9573\ \ [By\ p-value\ table]\\\\=0.0427=4.27\%](https://img.qammunity.org/2022/formulas/mathematics/college/rzksbcg89pvjwg9cfi2phj1qtkiy2r4hmt.png)
Hence, 4.27% of adults in the USA have stage 2 high blood pressure.