To solve 21) am I supposed to add 13 plus half of 13 (6.5) to the standard deviation and subtract what I get by 100?

21. 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 1.5 standard deviations of the mean. What percentage of individuals would be called "abnormal" and need to be retested? (note: this, and question 22 are the only timse you will need to consult a normal table or use the "rnorm" function in R to answer a question in this class) a. 1% mean = 90 b. 32% S : 13 c. 13% 1.5 SDS d. 5% 22. 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