1.The systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 120 and standard deviation of 22 .

Someone qualifies as having Stage 2 high blood pressure if their systolic blood pressure is 160 or higher.

Express your answers as a decimal and round to 2 decimal places.

a. Around what percentage of adults in the USA have stage 2 high blood pressure? Give your answer rounded to two decimal places.

%

b. Stage 1 high BP is specified as systolic BP between 140 and 160. What percentage of adults in the US qualify for stage 1?

%

2.Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally distributed with a mean of 6.7-in and a standard deviation of 1.1-in. Due to financial constraints, the helmets will be designed to fit all men except those with head breadths that are in the smallest 2.4% or largest 2.4%.

What is the minimum head breadth that will fit the clientele?

min =

What is the maximum head breadth that will fit the clientele?

min =

Enter your answer as a number accurate to1 decimal place.