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Chapter 2: Q. 3.1 (page 124)

Follow the method shown in the examples to answer each of the following questions. Use your calculator or the Normal Curve applet to check your answers.

1. Cholesterol levels above 240mg/dlmay require medical attention. What percent of 14-year-old boys have more than 240mg/dlof cholesterol?

Short Answer

Expert verified

The percentage of 14- years old boys have more than 240mg/dlis 1%

Step by step solution

01

Given Information 

Cholesterol levels may require medical attention =240mg/dlabove

Age of boys =14year old

02

Explanation 

Cholesterol levels above 240mg/dlmay require medical attention.

Find and interpretP(X>240).

P(X>240)=normalcdf(lower:240,upper:9999,μ=170,σ=30)P(X>240)=0.0098

03

Final Answer

There's about a 1%chance that a randomly selected 14-year old boy will have a cholesterol level above 240mg/dl.

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