Robot cats must play 10 to play video games. He got 90, 84, 8 1 and 93 points when he passed CET-6, CET-7, CET-8 and CET-9 respectively, and the average score after passing the first nine grades was higher.
The average score of the robot cat after passing the first nine levels is higher than the first five levels, so the average score of the robot cat after passing the first nine levels is lower than the last four levels: (90+84+8 1+93)÷4=87 (points).
Therefore, the total score of the robot cat after passing the first nine levels is less than 9.87, and the highest score can only be: 87×9- 1=782 (points).
If the robot cat wants to get an average score of more than 88 points after 10, then the total score of 10 should be at least: 88×10+1= 881(points).
Therefore, if he passes the 10 level, he must at least call 88 1-782=99 (points).