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Use Table A in the back of the book to find the proportion of observations from a standard Normal distribution that fall in each of the following regions. In each case, sketch a standard Normal curve and shade the area representing the region.

z<1.39

Short Answer

Expert verified

The standard Normal curve, with the region represented by the area, is as follows:

Step by step solution

01

Given Information 

Z-score : z<1.39

02

Explanation 

From Table A:

P(z<1.39)=0.9177

The graphical representation is:

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Most popular questions from this chapter

Measuring bone density Individuals with low bone density have a high risk of broken bones (fractures). Physicians who are concerned about low bone density (osteoporosis) in patients can refer them for specialized testing. Currently, the most common method for testing bone density is dual-energy X-ray absorptiometry (DEXA). A patient who undergoes a DEXA test usually gets bone density results in grams per square centimeter(g/cm2)and in standardized units. Judy, who is 25years old, has her bone density measured using DEXA. Her results indicate a bone density in the hip948g/cm2and a standardized score ofz=−1.45. In the reference population of For 25-year-old women like Judy, the mean bone density in the hip is 956g/cm2

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