<image>In the entire second year of junior high school, 320 students each took an exam before and after computer training. The scores were uniformly classified into three levels: "Fail", "Pass", and "Excellent". To understand the effect of the computer training, a draw selected 32 students, and their scores in both exams were plotted as a statistical chart as shown in . Based on the information provided in the statistical chart, answer the following questions:
(1) The median score level of these 32 students before the training is ____, and the median score level after the training is ____.
(2) The percentage of these 32 students whose scores were classified as "Fail" decreased from ____ to ____ after the training.
(3) It is estimated that the total number of students in the entire second year of junior high school with scores classified as "Pass" and "Excellent" after the training is ____.
(4) Do you think the above estimate is reasonable? Why?