The College Board reported the score distribution shown in the table for all students who took the 2013 AP Statistics exam.
Score Percent of Students
5 ……………………… 12.6
4 ……………………… 20.2
3 ……………………… 25.0
2 ……………………… 18.8
1 ……………………… 23.4
a) Find the mean and standard deviation of the scores.
b) If we select a random sample of 40 AP Statistics students, would you expect their scores to follow a Normal model? Explain.
c) Consider the mean scores of random samples of 40 AP Statistics students. Describe the sampling model for these means (shape, center, and spread).