# Approximately 30 of obese patients develop diabetes

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34. Approximately 30% of obese patients develop diabetes. Answer the following questions if a physician sees 10 patients who are obese. What is the probability that half of them will develop diabetes?
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35. A study is run to investigate body mass index (BMI) in children living in urban neighborhoods. Based on the following data: compute the sample mean, the sample standard deviation, and the median.29262432302227 2831
Sample SD:3.09Median: 28 36. The following table shows the distribution of BMI in children living in United States and European urban neighborhoods. (The data are in millions.) What is the probability that a child living in a U.S. urban neighborhood is overweight? NeighborhoodNormal WeightOverweightObeseUnited States1255040Europe1014221
37. Suppose that the probability that a child living in an urban area in the United States is obese is 20%. Ifa social worker sees 15 children living in urban areas, answer the following: What is the probability that none are obese?
38. Body mass index (BMI) in children is approximately normally distributed with a mean of 24.5 and a standard deviation of 6.2. In a random sample of 10 children, what is the probability that their mean BMI exceeds 25?
39. An investigator wants to test whether exposure to secondhand smoke before 1 year of life is associated with development of childhood asthma (defined as asthma diagnosed before 5 years of age). Give two possible study designs.
40. A study is run to estimate the incidence of atrial fibrillation (AF) in men and women over the age of 60.Development of atrial fibrillation was monitored over a 10-year follow-up period. The data are summarizedbelow. Using this data, compute the cumulative incidence of AF in men and in women.
41. The following data were collected in a survey of 8th graders and summarize their cell phone status. What proportion of the 8th graders have cell phones?
42. A ferritin test is a popular test to measure a person’s current iron stores. In women, ferritin is approximately normally distributed with a mean of 89 ng/mL and a standard deviation of 23 ng/mL.If 50 women are tested, what is the probability that the mean ferritin exceeds 90?
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