Numerical Measures The 2000 CDC growth charts were developed using a reference population of infants. A pediatrician looks up one of the charts and finds that the 97th percentile for weights of baby boys at 6-1/2 months is 20.2 pounds. This means that at least 3% of the 6-1/2-month-old baby boys in the reference population weigh 20.2 pounds or less, and at least 97% of these baby boys weigh 20.2 pounds or more. The 2000 CDC growth charts use a reference population of both breast-fed and formula-fed infants. It has been observed that breast-fed babies tend to gain weight more rapidly than formula-fed babies in the first 2 to 3 months of their lives, but they tend to weigh less than formula-fed babies from 6 to 12 months. Sarah is a healthy baby who was exclusively breast-fed for her first 12 months. Which of the following is most likely a description of her weights (at 3, 6, 9, and 12 months of age) as percentiles of the CDC growth chart reference population? 75th percentile at 3 months;: 85th percentile at 6 months; 95th percentile at 9 months; 95th percentile at 12 months O 65th percentile at 3 months; 35th percentile at 6 months; 30th percentile at 9 months: 20th percentile at 12 months 10th percentile at 3 months: 40th percentile at 6 months; 75th percentile at 9 months; 95th percentile at 12 months 30th percentile at 3 months: 30th percentile at 6 months; 30th percentile at 9 months: 30th percentile at 12 months The following are weights (in pounds) for a sample of 11 baby boys at the age of 18 months: O10th percentile at 3 months; 40th percentile at 6 months; 75th percentile at 9 months; 95th percentile at 12 months O 30th percentile at 3 months; 30th percentile at 6 months; 30th percentile at 9 months; 30th percentile at 12 months The following are weights (in pounds) for a sample of 11 baby boys at the age of 18 months: 21.8 22.2 23.4 24.6 25.1 26.7 27.3 28 29.8 30.9 31.2 The 80th percentile for these sample data is pounds. In the sample data, out of 11 observations are less than or equal to the 80th ercentile, and out of 11 observations are greater than or equal to this value. percentile, the second quartile is the percentile and the and the third For any data set, the first quartile is the quartile is the percentile. In the prior sample data, the first quartile is Therefore, the interquartile range is pounds, and the third quartile is A