Doctors often use body mass index (BMI) to measure obesity. BMI is weight/height2, where weight is measured in kilograms and height in meters. A BMI of 30 is getting up there. For American women age 18-24, the mean BMI is 24.6 and the variance is 29.4. Although the BMI for a typical woman in this group is something like______________ , the BMI of a typical woman will deviate from that central value by something like _________________. Fill in the blanks; explain briefly.