(1) Wang Liang's five scores can be obtained by using the bar chart, and then a line chart can be drawn, as shown:

(2) Li Ming's grades were 82, 84, 92, 94 and 98, and Wang Liang's grades were 99, 96, 88, 87 and 80.

So, Li Ming's median score is 92, and Li Ming's median score is 88.

The extreme range of Li Ming's grades is 98-82= 16, and the extreme range of Li Ming's grades is 99-80= 19.

Average score (score), median (score), range (score), variance (score 2), Li Ming 92 16 Wang Liang 88 19 (3), from the average score, both of them are 90 points; Judging from the trend of broken line, Li Ming's performance shows an upward trend, while Wang Liang's performance shows a downward trend;

Judging from the variance, Li Ming is more stable than Wang Liang. Comprehensive analysis shows that Li Ming will get higher grades in this senior high school entrance examination.