Assume blood-glucose levels in a population of adult women are normally distributed with mean 90 mg/dL and standard deviation 38 mg/dL. (a) Suppose the abnormal range were dened to be glucose levels outsideof1standarddeviationofthemean(i.e.,eitheratleast1standard deviation above the mean, or at least 1 standard deviation below mean). Individuals with abnormal levels will be retested. What percentage of individuals would be called abnormal and need to be retested? What is the normal range of glucose levels in units of mg/dL?

(b) Suppose the abnormal range were dened to be glucose levels outside of 2standard deviations of the mean. What percentage of individuals would now be called abnormal? What is the normal range of glucose levels (mg/dL)?