Question: A population of 20 scores produces the following distribution (13 pts. total): 15, 20, 30, 33, 19, 23, 17, 21, 13, 29, 10, 14, 20, 23, 16, 18, 21, 13, 28, 22

a. Construct a grouped frequency table with X, f, cf, p, cp, and percentile. (5 pts..)

b. If a student scores a 15, what percentile is she in? What about a score of 23? (4 pts.)

c. By hand, calculate the mean, the SS, the variance, and the standard deviation for these population scores. (4 pts.)