84 Reading Japanese books. Refer to the Reading in a Foreign Language (Apr. 2004) experiment to improve the Japanese reading comprehension levels of 14 University of Hawaii students, presented in Exercise 61 . The data on number of books read and grade for each student are saved in the JAPANESE file.

a. Find the range, variance, and standard deviation of the number of books read by students who earned an A grade.

b. Find the range, variance, and standard deviation of the number of books read by students who earned either a B or C grade.

c. Refer to parts a and b . Which of the two groups of students has a more variable distribution for number of books read?