Problem 95E

Math scores of eighth graders. According to the National Center for Education Statistics (2009), scores on a mathematics assessment test for United States eighth graders have a mean of 283, a 25th percentile of 259, a 75th percentile of 308, and a 90th percentile of 329. Interpret each of these numerical descriptive measures.

Problem 95E

Math scores of eighth graders. According to the National Center for Education Statistics (2009), scores on a mathematics assessment test for United States eighth graders have a mean of 283, a 25th percentile of 259, a 75th percentile of 308, and a 90th percentile of 329. Interpret each of these numerical descriptive measures.

Step-by-step solution

Step 1 of 4

Summary score data for 8th grade U.S students on a standardized test are provided.

A mean of 279 is the arithmetic average. All student scores are added and the sum is divided by the number of student scores. This is one measure of the center of the score distribution.