<image>A high school conducted an experiment to test the effect of "enhanced language reading comprehension" training on improving "math application problem" scores between two similar classes, Class A and Class B. Class A was the experimental group (enhanced language reading comprehension training), and Class B was the control group (regular teaching, no additional training). Before the experiment, the math application problem scores of students in both classes were nearly identical. After the experiment, the average scores (all taken as integers) from several math application problem tests were statistically analyzed, as shown in the table below: 
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It is stipulated that an average score above 80 points (excluding 80 points) is considered excellent.
(I) Please analyze and estimate the excellence rate of the two classes;
(II) Based on the statistical data above, fill out the following 2×2 contingency table, and determine whether there is a 75% confidence level to support that "enhanced language reading comprehension" training helps improve math application problem scores.
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