<image>At a school, all 320 eighth-grade students took an exam with the same level of difficulty before and after computer training, and their scores were classified into three levels: "Fail," "Pass," and "Excellent" according to a unified standard. To understand the effect of the computer training, 32 students were randomly selected, and their scores from the two exams were used to create a statistical chart, as shown in the figure below. Based on the information provided by the statistical chart, answer the following questions:

(1) The median score level of these 32 students in the exam before the training is ______, and the median score level in the exam after the training is ______.
(2) After the training, the percentage of students whose scores were classified as "Fail" decreased from ______ to ______.
(3) Estimate the total number of students in the entire eighth grade at the school whose scores were classified as "Pass" and "Excellent" after the training: ______.
(4) Do you think the above estimate is reasonable? Why?

