A physician routinely makes physical examinations of children. She is
a three-year-old girl has a height of only 87.8 cm. Heights of three-year-old girls have
a mean of 97.5cm and a standard deviation of 6.9cm (based on the data from the
National Health and Nutrition Examination Survey). Use the range rule of thumb to find
the maximum and minimum usual heights of three-year-old girls. Based on the result, is
the height of 87.8cm unusual? Should the physician be concerned