How do you go about setting a problem like this?

This question begins Exercise 3, which consists of questions 19-24). Assume blood-glucose levels in a population of adult women are approximately normally distributed with mean 90 mg/dL and standard deviation 13 mg/dL. - Suppose the "abnormal range" were defined to be glucose levels outside of 1 standard deviation of the mean (i.e., either at least 1 standard deviation above the mean, or at least 1 standard deviation below mean). What percentage of individuals would be called "abnormal" and need to be retested? a. 1% abnormal = +/ - ISD x - 90 ma/d L S = 13 ma / dL 20 Boo DII DD F2 F3 F4 F 5 F6 F7 F8 F9