Normal Distribution WS Number 3 Solutions.pdf

# At least 12048 c what proportion of test takers score

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At least 120.48 c. What proportion of test takers score a 130 or higher? About 3%

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3. Assume the cholesterol levels of adult American women can be described by a Normal model with a mean of 188 mg/dL and a standard deviation of 24. a. What percent of adult women do you expect to have cholesterol levels over 200 mg/dL? About 30.85% b. What percent of adult women do you expect to have cholesterol levels between 150 and 170 mg/dL? About 16.95% c. Estimate the interquartile range of the cholesterol levels. 32.16 d. Above what value are the highest 15% of women’s cholesterol levels? Above 212.96 4. While only 5% of babies have learned to walk by the age of 10 months, 75% have earned to walk by 13 months of age. If the age at which babies develop the ability to walk can be described by a Normal Distribution model, find the mean and standard deviation of the Normal model. mean = 12.14; SD = 1.282 5. Wildlife biologists believe that the weights of adult trout can be described by a Normal model. Fishermen report that 22% of all trout caught were thrown back because they weigh below the 2-pound minimum, and only 6% weighed over 5 pounds. What are the mean and standard deviation of the model? Mean = 3, SD = 1.293
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