21) The serum cholesterol levels for men in one age group are normally distributed with a mean 0 178.1 and a standard deviation of 40.9. All units are in mg/100 mL. Find the two levels that separate the top 9% and the bottom 9%. A) 165.0 mg/100mL and 191.19 mg/100mL B) 106.9 mg/100mL and 249.3 mg/lOOIr C) 123.3 mg/lOOmL and 232.9 mg/lOOmL D) 161.3 mg/lOOmL and 194.9 mg/lOOIr