1. Percentage point change between midterm and final grades for students in two sections of a stats
course are presented in a split back-to-back stem-and-leaf plot as follows: Key: 2 1 -0 -0 means
that the student in section A dropped by 2 percentage points between midterm grade and final
grade while the student in section B dropped by 4 points. (Percentage point change = final grade -
midterm grade)a. How many students in Section A had a worse final grade than midterm? b. How
many students in Section B did not experience a grade change? c. How many students in Section
B improved by more than 10 percentage points? d. What proportion of students in Section A
improved by more than 10 percentage points?e. Calculate the range of percentage point change
for Section A. f. Calculate the range of percentage point change for Section B. g. Describe the
shape of the Section A distribution in terms of skewness. h. Describe the shape of the Section B
distribution in terms of skewness.